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ChiSquareDistributionInnerDistributionFunction Method

Gets the cumulative distribution function (cdf) for the χ² distribution evaluated at point x.

Namespace:  Accord.Statistics.Distributions.Univariate
Assembly:  Accord.Statistics (in Accord.Statistics.dll) Version: 3.8.0
protected internal override double InnerDistributionFunction(
	double x
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Type: SystemDouble

Return Value

Type: Double

The Cumulative Distribution Function (CDF) describes the cumulative probability that a given value or any value smaller than it will occur.

The χ² distribution function is defined in terms of the Incomplete Gamma Function Γ(a, x) as CDF(x; df) = Γ(df/2, x/d).

See Also