public final class NormalDistribution extends ProbabilityDistribution implements NumericalConstants
GAMMA, GOLDEN_RATIO, SQRT2, SQRT2PI, TWO_PI
Constructor and Description |
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NormalDistribution()
Constructs the standard normal distribution (zero mean and unity variance).
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NormalDistribution(double[] array)
Constructs a normal distribution from a data set.
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NormalDistribution(double mu,
double var)
Constructs a normal distribution.
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Modifier and Type | Method and Description |
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double |
cumulative(double X)
Cumulative normal distribution function.
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double |
getMean()
Returns the mean.
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double |
getVariance()
Returns the variance.
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double |
inverse(double probability)
Inverse of the cumulative normal distribution function.
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double |
probability(double X)
Probability density function of a normal (Gaussian) distribution.
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checkRange, checkRange, findRoot
public NormalDistribution()
public NormalDistribution(double mu, double var)
mu
- the mean.var
- the variance.public NormalDistribution(double[] array)
array
- a sample.public double getMean()
public double getVariance()
public double probability(double X)
probability
in class ProbabilityDistribution
public double cumulative(double X)
cumulative
in class ProbabilityDistribution
public double inverse(double probability)
inverse
in class ProbabilityDistribution