pal.statistics
Class GammaDistribution
java.lang.Object
|
+--pal.statistics.GammaDistribution
- Direct Known Subclasses:
- ChiSquareDistribution, ExponentialDistribution
- public class GammaDistribution
- extends java.lang.Object
gamma distribution.
(Parameters: shape, scale; mean: scale*shape; variance: scale^2*shape)
Method Summary |
static double |
cdf(double x,
double shape,
double scale)
cumulative density function of the Gamma distribution |
static double |
mean(double shape,
double scale)
mean of the Gamma distribution |
static double |
pdf(double x,
double shape,
double scale)
probability density function of the Gamma distribution |
static double |
quantile(double y,
double shape,
double scale)
quantile (inverse cumulative density function) of the Gamma distribution |
static double |
variance(double shape,
double scale)
variance of the Gamma distribution |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
GammaDistribution
public GammaDistribution()
pdf
public static double pdf(double x,
double shape,
double scale)
- probability density function of the Gamma distribution
- Parameters:
x
- argumentshape
- shape parameterscale
- scale parameter- Returns:
- pdf value
cdf
public static double cdf(double x,
double shape,
double scale)
- cumulative density function of the Gamma distribution
- Parameters:
x
- argumentshape
- shape parameterscale
- scale parameter- Returns:
- cdf value
quantile
public static double quantile(double y,
double shape,
double scale)
- quantile (inverse cumulative density function) of the Gamma distribution
- Parameters:
y
- argumentshape
- shape parameterscale
- scale parameter- Returns:
- icdf value
mean
public static double mean(double shape,
double scale)
- mean of the Gamma distribution
- Parameters:
shape
- shape parameterscale
- scale parameter- Returns:
- mean
variance
public static double variance(double shape,
double scale)
- variance of the Gamma distribution
- Parameters:
shape
- shape parameterscale
- scale parameter- Returns:
- variance