Statistics.java
| Index Score | ||
|---|---|---|
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weka.core |
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Weka |
View: Reasons, Metrics, Source Code
These are the metrics that contribute to the Enerjy Score for this file, ranked by impact. So the metrics listed at the top influence the score to a greater extent that the metrics listed at the bottom.
| Metric | Description | |
|---|---|---|
| JAVA0177 | JAVA0177 Variable declaration missing initializer |  |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| COMPARISONS | Number of comparison operators | |
| LOGICAL_LINES | Number of statements | |
| JAVA0067 | JAVA0067 Array descriptor on identifier name | |
| ELOC | Effective lines of code | |
| OPERANDS | Number of operands | |
| LOC | Lines of code | |
| LINES | Number of lines in the source file | |
| PROGRAM_LENGTH | Halstead program length | |
| JAVA0076 | JAVA0076 Use of magic number | |
| JAVA0078 | JAVA0078 Floating point values compared with == | |
| OPERATORS | Number of operators | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| CYCLOMATIC | Cyclomatic complexity | |
| SIZE | Size of the file in bytes | |
| DOC_COMMENT | Number of javadoc comment lines | |
| UNIQUE_OPERANDS | Number of unique operands | |
| LOOPS | Number of loops | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| COMMENTS | Comment lines | |
| RETURNS | Number of return points from functions | |
| JAVA0064 | JAVA0064 N variations of identifier name (maximum: M) | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| DECL_COMMENTS | Comments in declarations | |
| JAVA0266 | JAVA0266 Use of System.out | |
| EXEC_COMMENTS | Comments in executable code | |
| PARAMS | Number of formal parameter declarations | |
| JAVA0035 | JAVA0035 Missing braces in for statement | |
| JAVA0084 | JAVA0084 Should use compound assignment operator | |
| BLOCKS | Number of blocks | |
| JAVA0163 | JAVA0163 Empty statement | |
| WHITESPACE | Number of whitespace lines | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| PROGRAM_VOLUME | Halstead program volume | |
| UNIQUE_OPERATORS | Number of unique operators | |
| JAVA0174 | JAVA0174 Assigned local variable never used | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| LINE_COMMENT | Number of line comments | |
| JAVA0145 | JAVA0145 Tab character used in source file | |
package weka.core;
/**
* Class implementing some distributions, tests, etc. The code is mostly adapted from the CERN
* Jet Java libraries:
*
* Copyright 2001 University of Waikato
* Copyright 1999 CERN - European Organization for Nuclear Research.
* Permission to use, copy, modify, distribute and sell this software and its documentation for
* any purpose is hereby granted without fee, provided that the above copyright notice appear
* in all copies and that both that copyright notice and this permission notice appear in
* supporting documentation.
* CERN and the University of Waikato make no representations about the suitability of this
* software for any purpose. It is provided "as is" without expressed or implied warranty.
*
* @author peter.gedeck@pharma.Novartis.com
* @author wolfgang.hoschek@cern.ch
* @author Eibe Frank (eibe@cs.waikato.ac.nz)
* @author Richard Kirkby (rkirkby@cs.waikato.ac.nz)
* @version $Revision: 1.10 $
*/
public class Statistics
implements RevisionHandler {
/** Some constants */
protected static final double MACHEP = 1.11022302462515654042E-16;
protected static final double MAXLOG = 7.09782712893383996732E2;
protected static final double MINLOG = -7.451332191019412076235E2;
protected static final double MAXGAM = 171.624376956302725;
protected static final double SQTPI = 2.50662827463100050242E0;
protected static final double SQRTH = 7.07106781186547524401E-1;
protected static final double LOGPI = 1.14472988584940017414;
protected static final double big = 4.503599627370496e15;
protected static final double biginv = 2.22044604925031308085e-16;
/*************************************************
* COEFFICIENTS FOR METHOD normalInverse() *
*************************************************/
/* approximation for 0 <= |y - 0.5| <= 3/8 */
protected static final double P0[] = {
-5.99633501014107895267E1,
9.80010754185999661536E1,
-5.66762857469070293439E1,
1.39312609387279679503E1,
-1.23916583867381258016E0,
};
protected static final double Q0[] = {
/* 1.00000000000000000000E0,*/
1.95448858338141759834E0,
4.67627912898881538453E0,
8.63602421390890590575E1,
-2.25462687854119370527E2,
2.00260212380060660359E2,
-8.20372256168333339912E1,
1.59056225126211695515E1,
-1.18331621121330003142E0,
};
/* Approximation for interval z = sqrt(-2 log y ) between 2 and 8
* i.e., y between exp(-2) = .135 and exp(-32) = 1.27e-14.
*/
protected static final double P1[] = {
4.05544892305962419923E0,
3.15251094599893866154E1,
5.71628192246421288162E1,
4.40805073893200834700E1,
1.46849561928858024014E1,
2.18663306850790267539E0,
-1.40256079171354495875E-1,
-3.50424626827848203418E-2,
-8.57456785154685413611E-4,
};
protected static final double Q1[] = {
/* 1.00000000000000000000E0,*/
1.57799883256466749731E1,
4.53907635128879210584E1,
4.13172038254672030440E1,
1.50425385692907503408E1,
2.50464946208309415979E0,
-1.42182922854787788574E-1,
-3.80806407691578277194E-2,
-9.33259480895457427372E-4,
};
/* Approximation for interval z = sqrt(-2 log y ) between 8 and 64
* i.e., y between exp(-32) = 1.27e-14 and exp(-2048) = 3.67e-890.
*/
protected static final double P2[] = {
3.23774891776946035970E0,
6.91522889068984211695E0,
3.93881025292474443415E0,
1.33303460815807542389E0,
2.01485389549179081538E-1,
1.23716634817820021358E-2,
3.01581553508235416007E-4,
2.65806974686737550832E-6,
6.23974539184983293730E-9,
};
protected static final double Q2[] = {
/* 1.00000000000000000000E0,*/
6.02427039364742014255E0,
3.67983563856160859403E0,
1.37702099489081330271E0,
2.16236993594496635890E-1,
1.34204006088543189037E-2,
3.28014464682127739104E-4,
2.89247864745380683936E-6,
6.79019408009981274425E-9,
};
/**
* Computes standard error for observed values of a binomial
* random variable.
*
* @param p the probability of success
* @param n the size of the sample
* @return the standard error
*/
public static double binomialStandardError(double p, int n) {
if (n == 0) {
return 0;
}
return Math.sqrt((p*(1-p))/(double) n);
}
/**
* Returns chi-squared probability for given value and degrees
* of freedom. (The probability that the chi-squared variate
* will be greater than x for the given degrees of freedom.)
*
* @param x the value
* @param v the number of degrees of freedom
* @return the chi-squared probability
*/
public static double chiSquaredProbability(double x, double v) {
if( x < 0.0 || v < 1.0 ) return 0.0;
return incompleteGammaComplement( v/2.0, x/2.0 );
}
/**
* Computes probability of F-ratio.
*
* @param F the F-ratio
* @param df1 the first number of degrees of freedom
* @param df2 the second number of degrees of freedom
* @return the probability of the F-ratio.
*/
public static double FProbability(double F, int df1, int df2) {
return incompleteBeta( df2/2.0, df1/2.0, df2/(df2+df1*F) );
}
/**
* Returns the area under the Normal (Gaussian) probability density
* function, integrated from minus infinity to <tt>x</tt>
* (assumes mean is zero, variance is one).
* <pre>
* x
* -
* 1 | | 2
* normal(x) = --------- | exp( - t /2 ) dt
* sqrt(2pi) | |
* -
* -inf.
*
* = ( 1 + erf(z) ) / 2
* = erfc(z) / 2
* </pre>
* where <tt>z = x/sqrt(2)</tt>.
* Computation is via the functions <tt>errorFunction</tt> and <tt>errorFunctionComplement</tt>.
*
* @param a the z-value
* @return the probability of the z value according to the normal pdf
*/
public static double normalProbability(double a) {
double x, y, z;
x = a * SQRTH;
z = Math.abs(x);
if( z < SQRTH ) y = 0.5 + 0.5 * errorFunction(x);
else {
y = 0.5 * errorFunctionComplemented(z);
if( x > 0 ) y = 1.0 - y;
}
return y;
}
/**
* Returns the value, <tt>x</tt>, for which the area under the
* Normal (Gaussian) probability density function (integrated from
* minus infinity to <tt>x</tt>) is equal to the argument <tt>y</tt>
* (assumes mean is zero, variance is one).
* <p>
* For small arguments <tt>0 < y < exp(-2)</tt>, the program computes
* <tt>z = sqrt( -2.0 * log(y) )</tt>; then the approximation is
* <tt>x = z - log(z)/z - (1/z) P(1/z) / Q(1/z)</tt>.
* There are two rational functions P/Q, one for <tt>0 < y < exp(-32)</tt>
* and the other for <tt>y</tt> up to <tt>exp(-2)</tt>.
* For larger arguments,
* <tt>w = y - 0.5</tt>, and <tt>x/sqrt(2pi) = w + w**3 R(w**2)/S(w**2))</tt>.
*
* @param y0 the area under the normal pdf
* @return the z-value
*/
public static double normalInverse(double y0) {
double x, y, z, y2, x0, x1;
int code;
final double s2pi = Math.sqrt(2.0*Math.PI);
if( y0 <= 0.0 ) throw new IllegalArgumentException();
if( y0 >= 1.0 ) throw new IllegalArgumentException();
code = 1;
y = y0;
if( y > (1.0 - 0.13533528323661269189) ) { /* 0.135... = exp(-2) */
y = 1.0 - y;
code = 0;
}
if( y > 0.13533528323661269189 ) {
y = y - 0.5;
y2 = y * y;
x = y + y * (y2 * polevl( y2, P0, 4)/p1evl( y2, Q0, 8 ));
x = x * s2pi;
return(x);
}
x = Math.sqrt( -2.0 * Math.log(y) );
x0 = x - Math.log(x)/x;
z = 1.0/x;
if( x < 8.0 ) /* y > exp(-32) = 1.2664165549e-14 */
x1 = z * polevl( z, P1, 8 )/p1evl( z, Q1, 8 );
else
x1 = z * polevl( z, P2, 8 )/p1evl( z, Q2, 8 );
x = x0 - x1;
if( code != 0 )
x = -x;
return( x );
}
/**
* Returns natural logarithm of gamma function.
*
* @param x the value
* @return natural logarithm of gamma function
*/
public static double lnGamma(double x) {
double p, q, w, z;
double A[] = {
8.11614167470508450300E-4,
-5.95061904284301438324E-4,
7.93650340457716943945E-4,
-2.77777777730099687205E-3,
8.33333333333331927722E-2
};
double B[] = {
-1.37825152569120859100E3,
-3.88016315134637840924E4,
-3.31612992738871184744E5,
-1.16237097492762307383E6,
-1.72173700820839662146E6,
-8.53555664245765465627E5
};
double C[] = {
/* 1.00000000000000000000E0, */
-3.51815701436523470549E2,
-1.70642106651881159223E4,
-2.20528590553854454839E5,
-1.13933444367982507207E6,
-2.53252307177582951285E6,
-2.01889141433532773231E6
};
if( x < -34.0 ) {
q = -x;
w = lnGamma(q);
p = Math.floor(q);
if( p == q ) throw new ArithmeticException("lnGamma: Overflow");
z = q - p;
if( z > 0.5 ) {
p += 1.0;
z = p - q;
}
z = q * Math.sin( Math.PI * z );
if( z == 0.0 ) throw new
ArithmeticException("lnGamma: Overflow");
z = LOGPI - Math.log( z ) - w;
return z;
}
if( x < 13.0 ) {
z = 1.0;
while( x >= 3.0 ) {
x -= 1.0;
z *= x;
}
while( x < 2.0 ) {
if( x == 0.0 ) throw new
ArithmeticException("lnGamma: Overflow");
z /= x;
x += 1.0;
}
if( z < 0.0 ) z = -z;
if( x == 2.0 ) return Math.log(z);
x -= 2.0;
p = x * polevl( x, B, 5 ) / p1evl( x, C, 6);
return( Math.log(z) + p );
}
if( x > 2.556348e305 ) throw new ArithmeticException("lnGamma: Overflow");
q = ( x - 0.5 ) * Math.log(x) - x + 0.91893853320467274178;
if( x > 1.0e8 ) return( q );
p = 1.0/(x*x);
if( x >= 1000.0 )
q += (( 7.9365079365079365079365e-4 * p
- 2.7777777777777777777778e-3) *p
+ 0.0833333333333333333333) / x;
else
q += polevl( p, A, 4 ) / x;
return q;
}
/**
* Returns the error function of the normal distribution.
* The integral is
* <pre>
* x
* -
* 2 | | 2
* erf(x) = -------- | exp( - t ) dt.
* sqrt(pi) | |
* -
* 0
* </pre>
* <b>Implementation:</b>
* For <tt>0 <= |x| < 1, erf(x) = x * P4(x**2)/Q5(x**2)</tt>; otherwise
* <tt>erf(x) = 1 - erfc(x)</tt>.
* <p>
* Code adapted from the <A HREF="http://www.sci.usq.edu.au/staff/leighb/graph/Top.html">
* Java 2D Graph Package 2.4</A>,
* which in turn is a port from the
* <A HREF="http://people.ne.mediaone.net/moshier/index.html#Cephes">Cephes 2.2</A>
* Math Library (C).
*
* @param a the argument to the function.
*/
static double errorFunction(double x) {
double y, z;
final double T[] = {
9.60497373987051638749E0,
9.00260197203842689217E1,
2.23200534594684319226E3,
7.00332514112805075473E3,
5.55923013010394962768E4
};
final double U[] = {
//1.00000000000000000000E0,
3.35617141647503099647E1,
5.21357949780152679795E2,
4.59432382970980127987E3,
2.26290000613890934246E4,
4.92673942608635921086E4
};
if( Math.abs(x) > 1.0 ) return( 1.0 - errorFunctionComplemented(x) );
z = x * x;
y = x * polevl( z, T, 4 ) / p1evl( z, U, 5 );
return y;
}
/**
* Returns the complementary Error function of the normal distribution.
* <pre>
* 1 - erf(x) =
*
* inf.
* -
* 2 | | 2
* erfc(x) = -------- | exp( - t ) dt
* sqrt(pi) | |
* -
* x
* </pre>
* <b>Implementation:</b>
* For small x, <tt>erfc(x) = 1 - erf(x)</tt>; otherwise rational
* approximations are computed.
* <p>
* Code adapted from the <A HREF="http://www.sci.usq.edu.au/staff/leighb/graph/Top.html">
* Java 2D Graph Package 2.4</A>,
* which in turn is a port from the
* <A HREF="http://people.ne.mediaone.net/moshier/index.html#Cephes">Cephes 2.2</A>
* Math Library (C).
*
* @param a the argument to the function.
*/
static double errorFunctionComplemented(double a) {
double x,y,z,p,q;
double P[] = {
2.46196981473530512524E-10,
5.64189564831068821977E-1,
7.46321056442269912687E0,
4.86371970985681366614E1,
1.96520832956077098242E2,
5.26445194995477358631E2,
9.34528527171957607540E2,
1.02755188689515710272E3,
5.57535335369399327526E2
};
double Q[] = {
//1.0
1.32281951154744992508E1,
8.67072140885989742329E1,
3.54937778887819891062E2,
9.75708501743205489753E2,
1.82390916687909736289E3,
2.24633760818710981792E3,
1.65666309194161350182E3,
5.57535340817727675546E2
};
double R[] = {
5.64189583547755073984E-1,
1.27536670759978104416E0,
5.01905042251180477414E0,
6.16021097993053585195E0,
7.40974269950448939160E0,
2.97886665372100240670E0
};
double S[] = {
//1.00000000000000000000E0,
2.26052863220117276590E0,
9.39603524938001434673E0,
1.20489539808096656605E1,
1.70814450747565897222E1,
9.60896809063285878198E0,
3.36907645100081516050E0
};
if( a < 0.0 ) x = -a;
else x = a;
if( x < 1.0 ) return 1.0 - errorFunction(a);
z = -a * a;
if( z < -MAXLOG ) {
if( a < 0 ) return( 2.0 );
else return( 0.0 );
}
z = Math.exp(z);
if( x < 8.0 ) {
p = polevl( x, P, 8 );
q = p1evl( x, Q, 8 );
} else {
p = polevl( x, R, 5 );
q = p1evl( x, S, 6 );
}
y = (z * p)/q;
if( a < 0 ) y = 2.0 - y;
if( y == 0.0 ) {
if( a < 0 ) return 2.0;
else return( 0.0 );
}
return y;
}
/**
* Evaluates the given polynomial of degree <tt>N</tt> at <tt>x</tt>.
* Evaluates polynomial when coefficient of N is 1.0.
* Otherwise same as <tt>polevl()</tt>.
* <pre>
* 2 N
* y = C + C x + C x +...+ C x
* 0 1 2 N
*
* Coefficients are stored in reverse order:
*
* coef[0] = C , ..., coef[N] = C .
* N 0
* </pre>
* The function <tt>p1evl()</tt> assumes that <tt>coef[N] = 1.0</tt> and is
* omitted from the array. Its calling arguments are
* otherwise the same as <tt>polevl()</tt>.
* <p>
* In the interest of speed, there are no checks for out of bounds arithmetic.
*
* @param x argument to the polynomial.
* @param coef the coefficients of the polynomial.
* @param N the degree of the polynomial.
*/
static double p1evl( double x, double coef[], int N ) {
double ans;
ans = x + coef[0];
for(int i=1; i<N; i++) ans = ans*x+coef[i];
return ans;
}
/**
* Evaluates the given polynomial of degree <tt>N</tt> at <tt>x</tt>.
* <pre>
* 2 N
* y = C + C x + C x +...+ C x
* 0 1 2 N
*
* Coefficients are stored in reverse order:
*
* coef[0] = C , ..., coef[N] = C .
* N 0
* </pre>
* In the interest of speed, there are no checks for out of bounds arithmetic.
*
* @param x argument to the polynomial.
* @param coef the coefficients of the polynomial.
* @param N the degree of the polynomial.
*/
static double polevl( double x, double coef[], int N ) {
double ans;
ans = coef[0];
for(int i=1; i<=N; i++) ans = ans*x+coef[i];
return ans;
}
/**
* Returns the Incomplete Gamma function.
* @param a the parameter of the gamma distribution.
* @param x the integration end point.
*/
static double incompleteGamma(double a, double x)
{
double ans, ax, c, r;
if( x <= 0 || a <= 0 ) return 0.0;
if( x > 1.0 && x > a ) return 1.0 - incompleteGammaComplement(a,x);
/* Compute x**a * exp(-x) / gamma(a) */
ax = a * Math.log(x) - x - lnGamma(a);
if( ax < -MAXLOG ) return( 0.0 );
ax = Math.exp(ax);
/* power series */
r = a;
c = 1.0;
ans = 1.0;
do {
r += 1.0;
c *= x/r;
ans += c;
}
while( c/ans > MACHEP );
return( ans * ax/a );
}
/**
* Returns the Complemented Incomplete Gamma function.
* @param a the parameter of the gamma distribution.
* @param x the integration start point.
*/
static double incompleteGammaComplement( double a, double x ) {
double ans, ax, c, yc, r, t, y, z;
double pk, pkm1, pkm2, qk, qkm1, qkm2;
if( x <= 0 || a <= 0 ) return 1.0;
if( x < 1.0 || x < a ) return 1.0 - incompleteGamma(a,x);
ax = a * Math.log(x) - x - lnGamma(a);
if( ax < -MAXLOG ) return 0.0;
ax = Math.exp(ax);
/* continued fraction */
y = 1.0 - a;
z = x + y + 1.0;
c = 0.0;
pkm2 = 1.0;
qkm2 = x;
pkm1 = x + 1.0;
qkm1 = z * x;
ans = pkm1/qkm1;
do {
c += 1.0;
y += 1.0;
z += 2.0;
yc = y * c;
pk = pkm1 * z - pkm2 * yc;
qk = qkm1 * z - qkm2 * yc;
if( qk != 0 ) {
r = pk/qk;
t = Math.abs( (ans - r)/r );
ans = r;
} else
t = 1.0;
pkm2 = pkm1;
pkm1 = pk;
qkm2 = qkm1;
qkm1 = qk;
if( Math.abs(pk) > big ) {
pkm2 *= biginv;
pkm1 *= biginv;
qkm2 *= biginv;
qkm1 *= biginv;
}
} while( t > MACHEP );
return ans * ax;
}
/**
* Returns the Gamma function of the argument.
*/
static double gamma(double x) {
double P[] = {
1.60119522476751861407E-4,
1.19135147006586384913E-3,
1.04213797561761569935E-2,
4.76367800457137231464E-2,
2.07448227648435975150E-1,
4.94214826801497100753E-1,
9.99999999999999996796E-1
};
double Q[] = {
-2.31581873324120129819E-5,
5.39605580493303397842E-4,
-4.45641913851797240494E-3,
1.18139785222060435552E-2,
3.58236398605498653373E-2,
-2.34591795718243348568E-1,
7.14304917030273074085E-2,
1.00000000000000000320E0
};
double p, z;
int i;
double q = Math.abs(x);
if( q > 33.0 ) {
if( x < 0.0 ) {
p = Math.floor(q);
if( p == q ) throw new ArithmeticException("gamma: overflow");
i = (int)p;
z = q - p;
if( z > 0.5 ) {
p += 1.0;
z = q - p;
}
z = q * Math.sin( Math.PI * z );
if( z == 0.0 ) throw new ArithmeticException("gamma: overflow");
z = Math.abs(z);
z = Math.PI/(z * stirlingFormula(q) );
return -z;
} else {
return stirlingFormula(x);
}
}
z = 1.0;
while( x >= 3.0 ) {
x -= 1.0;
z *= x;
}
while( x < 0.0 ) {
if( x == 0.0 ) {
throw new ArithmeticException("gamma: singular");
} else
if( x > -1.E-9 ) {
return( z/((1.0 + 0.5772156649015329 * x) * x) );
}
z /= x;
x += 1.0;
}
while( x < 2.0 ) {
if( x == 0.0 ) {
throw new ArithmeticException("gamma: singular");
} else
if( x < 1.e-9 ) {
return( z/((1.0 + 0.5772156649015329 * x) * x) );
}
z /= x;
x += 1.0;
}
if( (x == 2.0) || (x == 3.0) ) return z;
x -= 2.0;
p = polevl( x, P, 6 );
q = polevl( x, Q, 7 );
return z * p / q;
}
/**
* Returns the Gamma function computed by Stirling's formula.
* The polynomial STIR is valid for 33 <= x <= 172.
*/
static double stirlingFormula(double x) {
double STIR[] = {
7.87311395793093628397E-4,
-2.29549961613378126380E-4,
-2.68132617805781232825E-3,
3.47222221605458667310E-3,
8.33333333333482257126E-2,
};
double MAXSTIR = 143.01608;
double w = 1.0/x;
double y = Math.exp(x);
w = 1.0 + w * polevl( w, STIR, 4 );
if( x > MAXSTIR ) {
/* Avoid overflow in Math.pow() */
double v = Math.pow( x, 0.5 * x - 0.25 );
y = v * (v / y);
} else {
y = Math.pow( x, x - 0.5 ) / y;
}
y = SQTPI * y * w;
return y;
}
/**
* Returns the Incomplete Beta Function evaluated from zero to <tt>xx</tt>.
*
* @param aa the alpha parameter of the beta distribution.
* @param bb the beta parameter of the beta distribution.
* @param xx the integration end point.
*/
public static double incompleteBeta( double aa, double bb, double xx ) {
double a, b, t, x, xc, w, y;
boolean flag;
if( aa <= 0.0 || bb <= 0.0 ) throw new
ArithmeticException("ibeta: Domain error!");
if( (xx <= 0.0) || ( xx >= 1.0) ) {
if( xx == 0.0 ) return 0.0;
if( xx == 1.0 ) return 1.0;
throw new ArithmeticException("ibeta: Domain error!");
}
flag = false;
if( (bb * xx) <= 1.0 && xx <= 0.95) {
t = powerSeries(aa, bb, xx);
return t;
}
w = 1.0 - xx;
/* Reverse a and b if x is greater than the mean. */
if( xx > (aa/(aa+bb)) ) {
flag = true;
a = bb;
b = aa;
xc = xx;
x = w;
} else {
a = aa;
b = bb;
xc = w;
x = xx;
}
if( flag && (b * x) <= 1.0 && x <= 0.95) {
t = powerSeries(a, b, x);
if( t <= MACHEP ) t = 1.0 - MACHEP;
else t = 1.0 - t;
return t;
}
/* Choose expansion for better convergence. */
y = x * (a+b-2.0) - (a-1.0);
if( y < 0.0 )
w = incompleteBetaFraction1( a, b, x );
else
w = incompleteBetaFraction2( a, b, x ) / xc;
/* Multiply w by the factor
a b _ _ _
x (1-x) | (a+b) / ( a | (a) | (b) ) . */
y = a * Math.log(x);
t = b * Math.log(xc);
if( (a+b) < MAXGAM && Math.abs(y) < MAXLOG && Math.abs(t) < MAXLOG ) {
t = Math.pow(xc,b);
t *= Math.pow(x,a);
t /= a;
t *= w;
t *= gamma(a+b) / (gamma(a) * gamma(b));
if( flag ) {
if( t <= MACHEP ) t = 1.0 - MACHEP;
else t = 1.0 - t;
}
return t;
}
/* Resort to logarithms. */
y += t + lnGamma(a+b) - lnGamma(a) - lnGamma(b);
y += Math.log(w/a);
if( y < MINLOG )
t = 0.0;
else
t = Math.exp(y);
if( flag ) {
if( t <= MACHEP ) t = 1.0 - MACHEP;
else t = 1.0 - t;
}
return t;
}
/**
* Continued fraction expansion #1 for incomplete beta integral.
*/
static double incompleteBetaFraction1( double a, double b, double x ) {
double xk, pk, pkm1, pkm2, qk, qkm1, qkm2;
double k1, k2, k3, k4, k5, k6, k7, k8;
double r, t, ans, thresh;
int n;
k1 = a;
k2 = a + b;
k3 = a;
k4 = a + 1.0;
k5 = 1.0;
k6 = b - 1.0;
k7 = k4;
k8 = a + 2.0;
pkm2 = 0.0;
qkm2 = 1.0;
pkm1 = 1.0;
qkm1 = 1.0;
ans = 1.0;
r = 1.0;
n = 0;
thresh = 3.0 * MACHEP;
do {
xk = -( x * k1 * k2 )/( k3 * k4 );
pk = pkm1 + pkm2 * xk;
qk = qkm1 + qkm2 * xk;
pkm2 = pkm1;
pkm1 = pk;
qkm2 = qkm1;
qkm1 = qk;
xk = ( x * k5 * k6 )/( k7 * k8 );
pk = pkm1 + pkm2 * xk;
qk = qkm1 + qkm2 * xk;
pkm2 = pkm1;
pkm1 = pk;
qkm2 = qkm1;
qkm1 = qk;
if( qk != 0 ) r = pk/qk;
if( r != 0 ) {
t = Math.abs( (ans - r)/r );
ans = r;
} else
t = 1.0;
if( t < thresh ) return ans;
k1 += 1.0;
k2 += 1.0;
k3 += 2.0;
k4 += 2.0;
k5 += 1.0;
k6 -= 1.0;
k7 += 2.0;
k8 += 2.0;
if( (Math.abs(qk) + Math.abs(pk)) > big ) {
pkm2 *= biginv;
pkm1 *= biginv;
qkm2 *= biginv;
qkm1 *= biginv;
}
if( (Math.abs(qk) < biginv) || (Math.abs(pk) < biginv) ) {
pkm2 *= big;
pkm1 *= big;
qkm2 *= big;
qkm1 *= big;
}
} while( ++n < 300 );
return ans;
}
/**
* Continued fraction expansion #2 for incomplete beta integral.
*/
static double incompleteBetaFraction2( double a, double b, double x ) {
double xk, pk, pkm1, pkm2, qk, qkm1, qkm2;
double k1, k2, k3, k4, k5, k6, k7, k8;
double r, t, ans, z, thresh;
int n;
k1 = a;
k2 = b - 1.0;
k3 = a;
k4 = a + 1.0;
k5 = 1.0;
k6 = a + b;
k7 = a + 1.0;;
k8 = a + 2.0;
pkm2 = 0.0;
qkm2 = 1.0;
pkm1 = 1.0;
qkm1 = 1.0;
z = x / (1.0-x);
ans = 1.0;
r = 1.0;
n = 0;
thresh = 3.0 * MACHEP;
do {
xk = -( z * k1 * k2 )/( k3 * k4 );
pk = pkm1 + pkm2 * xk;
qk = qkm1 + qkm2 * xk;
pkm2 = pkm1;
pkm1 = pk;
qkm2 = qkm1;
qkm1 = qk;
xk = ( z * k5 * k6 )/( k7 * k8 );
pk = pkm1 + pkm2 * xk;
qk = qkm1 + qkm2 * xk;
pkm2 = pkm1;
pkm1 = pk;
qkm2 = qkm1;
qkm1 = qk;
if( qk != 0 ) r = pk/qk;
if( r != 0 ) {
t = Math.abs( (ans - r)/r );
ans = r;
} else
t = 1.0;
if( t < thresh ) return ans;
k1 += 1.0;
k2 -= 1.0;
k3 += 2.0;
k4 += 2.0;
k5 += 1.0;
k6 += 1.0;
k7 += 2.0;
k8 += 2.0;
if( (Math.abs(qk) + Math.abs(pk)) > big ) {
pkm2 *= biginv;
pkm1 *= biginv;
qkm2 *= biginv;
qkm1 *= biginv;
}
if( (Math.abs(qk) < biginv) || (Math.abs(pk) < biginv) ) {
pkm2 *= big;
pkm1 *= big;
qkm2 *= big;
qkm1 *= big;
}
} while( ++n < 300 );
return ans;
}
/**
* Power series for incomplete beta integral.
* Use when b*x is small and x not too close to 1.
*/
static double powerSeries( double a, double b, double x ) {
double s, t, u, v, n, t1, z, ai;
ai = 1.0 / a;
u = (1.0 - b) * x;
v = u / (a + 1.0);
t1 = v;
t = u;
n = 2.0;
s = 0.0;
z = MACHEP * ai;
while( Math.abs(v) > z ) {
u = (n - b) * x / n;
t *= u;
v = t / (a + n);
s += v;
n += 1.0;
}
s += t1;
s += ai;
u = a * Math.log(x);
if( (a+b) < MAXGAM && Math.abs(u) < MAXLOG ) {
t = gamma(a+b)/(gamma(a)*gamma(b));
s = s * t * Math.pow(x,a);
} else {
t = lnGamma(a+b) - lnGamma(a) - lnGamma(b) + u + Math.log(s);
if( t < MINLOG ) s = 0.0;
else s = Math.exp(t);
}
return s;
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 1.10 $");
}
/**
* Main method for testing this class.
*/
public static void main(String[] ops) {
System.out.println("Binomial standard error (0.5, 100): " +
Statistics.binomialStandardError(0.5, 100));
System.out.println("Chi-squared probability (2.558, 10): " +
Statistics.chiSquaredProbability(2.558, 10));
System.out.println("Normal probability (0.2): " +
Statistics.normalProbability(0.2));
System.out.println("F probability (5.1922, 4, 5): " +
Statistics.FProbability(5.1922, 4, 5));
System.out.println("lnGamma(6): "+ Statistics.lnGamma(6));
}
}
The table below shows all metrics for Statistics.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 69.00 | Number of blocks | |
| BLOCK_COMMENT | 21.00 | Number of block comment lines | |
| COMMENTS | 250.00 | Comment lines | |
| COMMENT_DENSITY | 0.39 | Comment density | |
| COMPARISONS | 159.00 | Number of comparison operators | |
| CYCLOMATIC | 120.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 26.00 | Comments in declarations | |
| DOC_COMMENT | 226.00 | Number of javadoc comment lines | |
| ELOC | 633.00 | Effective lines of code | |
| EXEC_COMMENTS | 15.00 | Comments in executable code | |
| EXITS | 26.00 | Procedure exits | |
| FUNCTIONS | 20.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 100.10 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 100.00 | Interface complexity | |
| JAVA0001 | 0.00 | JAVA0001 Package name does not contain only lower case letters | |
| JAVA0002 | 1.00 | JAVA0002 Package name does not begin with a top level domain name or country code | |
| JAVA0003 | 0.00 | JAVA0003 Minimize use of on-demand (.*) imports | |
| JAVA0004 | 0.00 | JAVA0004 Unnecessary import from java.lang | |
| JAVA0005 | 0.00 | JAVA0005 Imports not in specified order | |
| JAVA0006 | 0.00 | JAVA0006 Empty finally block | |
| JAVA0007 | 0.00 | JAVA0007 Should not declare public field | |
| JAVA0008 | 0.00 | JAVA0008 Empty catch block | |
| JAVA0009 | 0.00 | JAVA0009 Protected member in final class | |
| JAVA0010 | 0.00 | JAVA0010 Non-instantiable class does not contain a non-private static member | |
| JAVA0011 | 0.00 | JAVA0011 Abstract class does not contain an abstract method | |
| JAVA0012 | 0.00 | JAVA0012 Non-constructor method with same name as declaring class | |
| JAVA0013 | 0.00 | JAVA0013 Non-blank final field is not static | |
| JAVA0014 | 0.00 | JAVA0014 Class with only static members has non-private constructor | |
| JAVA0015 | 0.00 | JAVA0015 Package class contains public nested type | |
| JAVA0016 | 0.00 | JAVA0016 Abstract class contains public constructor | |
| JAVA0017 | 0.00 | JAVA0017 Class name does not have required form | |
| JAVA0018 | 0.00 | JAVA0018 Method name does not have required form | |
| JAVA0019 | 0.00 | JAVA0019 Interface name does not have required form | |
| JAVA0020 | 0.00 | JAVA0020 Field name does not have required form | |
| JAVA0021 | 0.00 | JAVA0021 Interface method name does not have required form | |
| JAVA0022 | 0.00 | JAVA0022 Static final field name does not have required form | |
| JAVA0023 | 0.00 | JAVA0023 Empty finalize method | |
| JAVA0024 | 0.00 | JAVA0024 Empty class | |
| JAVA0025 | 0.00 | JAVA0025 Method override is empty | |
| JAVA0026 | 0.00 | JAVA0026 Finalize method with parameters | |
| JAVA0029 | 0.00 | JAVA0029 Private method not used | |
| JAVA0030 | 0.00 | JAVA0030 Private field not used | |
| JAVA0031 | 0.00 | JAVA0031 Case statement not properly closed | |
| JAVA0032 | 0.00 | JAVA0032 Switch statement missing default | |
| JAVA0033 | 0.00 | JAVA0033 default: not last case in switch statement | |
| JAVA0034 | 57.00 | JAVA0034 Missing braces in if statement | |
| JAVA0035 | 2.00 | JAVA0035 Missing braces in for statement | |
| JAVA0036 | 0.00 | JAVA0036 Missing braces in while statement | |
| JAVA0038 | 0.00 | JAVA0038 Non-case label in switch statement | |
| JAVA0039 | 0.00 | JAVA0039 Break statement with label | |
| JAVA0040 | 0.00 | JAVA0040 Switch statement contains N cases (maximum: M) | |
| JAVA0041 | 0.00 | JAVA0041 Nested synchronized block | |
| JAVA0042 | 0.00 | JAVA0042 Empty synchronized statement | |
| JAVA0043 | 0.00 | JAVA0043 Inner class does not use outer class | |
| JAVA0044 | 0.00 | JAVA0044 Serializable class with no instance variables | |
| JAVA0045 | 0.00 | JAVA0045 Serializable class with only transient fields | |
| JAVA0046 | 0.00 | JAVA0046 Name of class not derived from Exception ends with 'Exception' | |
| JAVA0047 | 0.00 | JAVA0047 Serializable class derives from invalid base class | |
| JAVA0048 | 0.00 | JAVA0048 Name of class derived from Exception does not end with 'Exception' | |
| JAVA0049 | 0.00 | JAVA0049 Nested block at depth N (maximum: M) | |
| JAVA0050 | 0.00 | JAVA0050 Class derives from java.lang.Error | |
| JAVA0051 | 0.00 | JAVA0051 Class derives from java.lang.RuntimeException | |
| JAVA0052 | 0.00 | JAVA0052 Class derives from java.lang.Throwable | |
| JAVA0053 | 0.00 | JAVA0053 Unused label | |
| JAVA0054 | 0.00 | JAVA0054 Inheritance depth N exceeds maximum M | |
| JAVA0055 | 0.00 | JAVA0055 Class should be interface | |
| JAVA0056 | 0.00 | JAVA0056 Unnecessary abstract modifier for interface or annotation | |
| JAVA0057 | 0.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 0.00 | JAVA0058 Constructor calls super() | |
| JAVA0059 | 0.00 | JAVA0059 Method override only calls super() | |
| JAVA0061 | 0.00 | JAVA0061 Inaccessible member in anonymous class | |
| JAVA0062 | 0.00 | JAVA0062 Public class missing public member or protected constructor | |
| JAVA0063 | 0.00 | JAVA0063 Identifier name should not contain '$' | |
| JAVA0064 | 10.00 | JAVA0064 N variations of identifier name (maximum: M) | |
| JAVA0065 | 0.00 | JAVA0065 Unnecessary final modifier for method in final class | |
| JAVA0066 | 0.00 | JAVA0066 Unnecessary modifier for interface nested type | |
| JAVA0067 | 18.00 | JAVA0067 Array descriptor on identifier name | |
| JAVA0068 | 0.00 | JAVA0068 Modifiers not declared in recommended order | |
| JAVA0071 | 0.00 | JAVA0071 Strings compared with == | |
| JAVA0073 | 0.00 | JAVA0073 Integer division in floating-point context | |
| JAVA0074 | 0.00 | JAVA0074 Use of Object.notify() | |
| JAVA0075 | 0.00 | JAVA0075 Method parameter hides field | |
| JAVA0076 | 31.00 | JAVA0076 Use of magic number | |
| JAVA0077 | 0.00 | JAVA0077 Private field not used in declaring class | |
| JAVA0078 | 18.00 | JAVA0078 Floating point values compared with == | |
| JAVA0079 | 0.00 | JAVA0079 Use of instance to reference static member | |
| JAVA0080 | 0.00 | JAVA0080 Import declaration not used | |
| JAVA0081 | 0.00 | JAVA0081 Boolean literal in comparison | |
| JAVA0082 | 0.00 | JAVA0082 Unnecessary widening cast | |
| JAVA0083 | 0.00 | JAVA0083 Unnecessary instanceof test | |
| JAVA0084 | 3.00 | JAVA0084 Should use compound assignment operator | |
| JAVA0085 | 0.00 | JAVA0085 Use of sun.* class | |
| JAVA0087 | 0.00 | JAVA0087 Use of Thread.sleep() | |
| JAVA0089 | 0.00 | JAVA0089 Use of restricted package | |
| JAVA0092 | 0.00 | JAVA0092 Use of restricted type | |
| JAVA0093 | 0.00 | JAVA0093 Redundant assignment | |
| JAVA0094 | 0.00 | JAVA0094 Field hides a superclass field | |
| JAVA0095 | 0.00 | JAVA0095 Uninitialized private field | |
| JAVA0096 | 0.00 | JAVA0096 Field in nested class hides outer field | |
| JAVA0098 | 0.00 | JAVA0098 Minimize use of implicit field initializers | |
| JAVA0100 | 0.00 | JAVA0100 Class contains N non-final fields (maximum: M) | |
| JAVA0101 | 0.00 | JAVA0101 Unnecessary modifier for field in interface | |
| JAVA0102 | 0.00 | JAVA0102 Last statement in finalize() not super.finalize() | |
| JAVA0103 | 0.00 | JAVA0103 Explicit call to finalize() | |
| JAVA0104 | 0.00 | JAVA0104 finalize() only calls super.finalize() | |
| JAVA0105 | 0.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 0.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 13.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 1.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 12.00 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0111 | 0.00 | JAVA0111 Incorrect javadoc: @return tag for void method | |
| JAVA0112 | 0.00 | JAVA0112 Incorrect javadoc: no exception 'exception' in throws | |
| JAVA0113 | 0.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 0.00 | JAVA0114 Incorrect javadoc: no @version tag | |
| JAVA0115 | 0.00 | JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception' | |
| JAVA0116 | 0.00 | JAVA0116 Missing javadoc: field 'field' | |
| JAVA0117 | 0.00 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0118 | 0.00 | JAVA0118 Missing javadoc: type 'type' | |
| JAVA0119 | 0.00 | JAVA0119 Control variable changed within body of for loop | |
| JAVA0123 | 0.00 | JAVA0123 Use all three components of for loop | |
| JAVA0125 | 0.00 | JAVA0125 Continue statement with label | |
| JAVA0126 | 0.00 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0128 | 0.00 | JAVA0128 Public constructor in non-public class | |
| JAVA0130 | 0.00 | JAVA0130 Non-static method does not use instance fields | |
| JAVA0131 | 0.00 | JAVA0131 Compatible method does not override base | |
| JAVA0132 | 0.00 | JAVA0132 Method overload with compatible signature | |
| JAVA0133 | 0.00 | JAVA0133 Non-synchronized method overrides synchronized method | |
| JAVA0135 | 0.00 | JAVA0135 Only one of Object.equals and Object.hashCode defined: missing 'method' | |
| JAVA0136 | 0.00 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0137 | 0.00 | JAVA0137 Non-abstract class missing constructor | |
| JAVA0138 | 0.00 | JAVA0138 N parameters defined for method (maximum: M) | |
| JAVA0139 | 0.00 | JAVA0139 Definition of main other than public static void main(java.lang.String[]) | |
| JAVA0141 | 0.00 | JAVA0141 Unnecessary modifier for method in interface | |
| JAVA0143 | 0.00 | JAVA0143 Synchronized method | |
| JAVA0144 | 0.00 | JAVA0144 Line exceeds maximum M characters | |
| JAVA0145 | 89.00 | JAVA0145 Tab character used in source file | |
| JAVA0150 | 0.00 | JAVA0150 java.lang.Error (or subclass) thrown | |
| JAVA0153 | 0.00 | JAVA0153 Inefficient conversion of integer to string | |
| JAVA0159 | 0.00 | JAVA0159 Inefficient conversion of string to integer | |
| JAVA0160 | 0.00 | JAVA0160 Method does not throw specified exception | |
| JAVA0161 | 0.00 | JAVA0161 Conditional wait() not in loop | |
| JAVA0163 | 1.00 | JAVA0163 Empty statement | |
| JAVA0165 | 0.00 | JAVA0165 Conflicting return statement in finally block | |
| JAVA0166 | 0.00 | JAVA0166 Generic exception caught | |
| JAVA0167 | 0.00 | JAVA0167 ThreadDeath not rethrown | |
| JAVA0169 | 0.00 | JAVA0169 Unnecessary catch block: exception 'exception' | |
| JAVA0170 | 0.00 | JAVA0170 Caught exception not derived from java.lang.Exception | |
| JAVA0171 | 0.00 | JAVA0171 Unused local variable | |
| JAVA0173 | 0.00 | JAVA0173 Unused method parameter | |
| JAVA0174 | 1.00 | JAVA0174 Assigned local variable never used | |
| JAVA0175 | 0.00 | JAVA0175 Successive assignment to variable | |
| JAVA0176 | 0.00 | JAVA0176 Local variable name does not have required form | |
| JAVA0177 | 101.00 | JAVA0177 Variable declaration missing initializer | |
| JAVA0179 | 0.00 | JAVA0179 Local variable hides visible field | |
| JAVA0233 | 0.00 | JAVA0233 Definition of serialVersionUID other than 'private static final long serialVersionUID' | |
| JAVA0234 | 0.00 | JAVA0234 Class is Serializable but does not define serialVersionUID | |
| JAVA0235 | 0.00 | JAVA0235 Class defines serialVersionUID but does not implement Serializable | |
| JAVA0236 | 0.00 | JAVA0236 Attempt to clone an object which does not implement Cloneable | |
| JAVA0237 | 0.00 | JAVA0237 Class implements Cloneable but does not have public clone method | |
| JAVA0238 | 0.00 | JAVA0238 Clone method does not call super.clone() | |
| JAVA0239 | 0.00 | JAVA0239 Class declares 'readObject' or 'writeObject' but does not implement Serializable | |
| JAVA0240 | 0.00 | JAVA0240 Serializable class which declares readObject or writeObject but not both | |
| JAVA0241 | 0.00 | JAVA0241 'readObject' or 'writeObject' should be declared private in Serializable class | |
| JAVA0242 | 0.00 | JAVA0242 Transient field in non-Serializable class | |
| JAVA0243 | 0.00 | JAVA0243 'readResolve' or 'writeReplace' should be declared private or protected | |
| JAVA0244 | 0.00 | JAVA0244 Field or method name in subclass differs only by case from inherited field or method | |
| JAVA0245 | 0.00 | JAVA0245 JUnit TestCase with non-trivial constructor | |
| JAVA0246 | 0.00 | JAVA0246 JUnit assertXXX statement missing message parameter | |
| JAVA0247 | 0.00 | JAVA0247 JUnit 'setUp()' and 'tearDown()' should call super method | |
| JAVA0248 | 0.00 | JAVA0248 JUnit method 'setUp' or 'tearDown' with incorrect signature | |
| JAVA0249 | 0.00 | JAVA0249 JUnit TestCase 'suite()' should be declared static | |
| JAVA0250 | 0.00 | JAVA0250 JUnit TestCase declares testXXX method with incorrect signature | |
| JAVA0251 | 0.00 | JAVA0251 Use '%n' for line breaks in printf/format for platform independence | |
| JAVA0252 | 0.00 | JAVA0252 'enum' is a Java 1.5 reserved word | |
| JAVA0253 | 0.00 | JAVA0253 Not all enum constants consumed in switch statement | |
| JAVA0254 | 0.00 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| JAVA0255 | 0.00 | JAVA0255 Result of method invocation not used | |
| JAVA0256 | 0.00 | JAVA0256 Assignment of external collection/array to field | |
| JAVA0257 | 0.00 | JAVA0257 Use of 'Constant Interface' anti-pattern | |
| JAVA0258 | 0.00 | JAVA0258 Implement Iterable for foreach compatibility | |
| JAVA0259 | 0.00 | JAVA0259 Return of collection/array field | |
| JAVA0260 | 0.00 | JAVA0260 Use 'enum' instead of Enumerated Type pattern | |
| JAVA0261 | 0.00 | JAVA0261 Use specialized Enum collection types | |
| JAVA0262 | 0.00 | JAVA0262 Use of char in integer context | |
| JAVA0263 | 0.00 | JAVA0263 Long literal ends with 'l' instead of 'L' | |
| JAVA0264 | 0.00 | JAVA0264 Integer math in long context - check for overflow | |
| JAVA0265 | 0.00 | JAVA0265 Use of Throwable.printStackTrace() | |
| JAVA0266 | 5.00 | JAVA0266 Use of System.out | |
| JAVA0267 | 0.00 | JAVA0267 Use of System.err | |
| JAVA0269 | 0.00 | JAVA0269 Contents of StringBuffer never used | |
| JAVA0270 | 0.00 | JAVA0270 Use Java 5.0 enhanced for loop construct to iterate over all elements in an array | |
| JAVA0271 | 0.00 | JAVA0271 Minimize use of on-demand (.*) static imports | |
| JAVA0272 | 0.00 | JAVA0272 Thread.run() called | |
| JAVA0273 | 0.00 | JAVA0273 Non-final derivative of Thread calls start() in constructor | |
| JAVA0274 | 0.00 | JAVA0274 Serializable class has a synchronized readObject() | |
| JAVA0275 | 0.00 | JAVA0275 Serializable class has a synchronized writeObject() and no other synchronized methods | |
| JAVA0276 | 0.00 | JAVA0276 Unnecessary use of String constructor | |
| JAVA0277 | 0.00 | JAVA0277 Iterator.next() implementation does not throw NoSuchElementException | |
| JAVA0278 | 0.00 | JAVA0278 Unnecessary use of Boolean constructor | |
| JAVA0279 | 0.00 | JAVA0279 Serialization method readObject or readObjectNoData calls an overridable method | |
| JAVA0280 | 0.00 | JAVA0280 IllegalMonitorStateException caught | |
| JAVA0281 | 0.00 | JAVA0281 Iterator.next() not called in loop | |
| JAVA0282 | 0.00 | JAVA0282 Call to Iterator.next() in loop which does not test Iterator.hasNext() | |
| JAVA0283 | 0.00 | JAVA0283 Control variable not updated in loop body | |
| JAVA0284 | 0.00 | JAVA0284 Explicit garbage collection | |
| JAVA0285 | 0.00 | JAVA0285 Dereference of potentially null variable | |
| JAVA0286 | 0.00 | JAVA0286 Dereference of null variable | |
| JAVA0287 | 0.00 | JAVA0287 Unnecessary null check | |
| JAVA0288 | 0.00 | JAVA0288 Inconsistent null check | |
| LINES | 1069.00 | Number of lines in the source file | |
| LINE_COMMENT | 3.00 | Number of line comments | |
| LOC | 691.00 | Lines of code | |
| LOGICAL_LINES | 403.00 | Number of statements | |
| LOOPS | 12.00 | Number of loops | |
| NEST_DEPTH | 4.00 | Maximum nesting depth | |
| OPERANDS | 1635.00 | Number of operands | |
| OPERATORS | 2647.00 | Number of operators | |
| PARAMS | 37.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 4282.00 | Halstead program length | |
| PROGRAM_VOCAB | 440.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 63.00 | Number of return points from functions | |
| SIZE | 27245.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 392.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 48.00 | Number of unique operators | |
| WHITESPACE | 128.00 | Number of whitespace lines | |