Module: Distribution::ChiSquare

Defined in:: lib/distribution/chisquare.rb

Overview

Calculate cdf and inverse cdf for Chi Square Distribution.

Based on Statistics2 module

Class Method Summary collapse

.cdf(x, k) ⇒ Object

Chi-square cumulative distribution function (cdf).
.p_value(pr, k) ⇒ Object

Return the P-value of the corresponding integral with k degrees of freedom.

Class Method Details

.cdf(x, k) ⇒ `Object`

Chi-square cumulative distribution function (cdf).

Returns the integral of Chi-squared distribution with k degrees of freedom over [0, x]



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# File 'lib/distribution/chisquare.rb', line 18

def cdf(x,k)
    Statistics2.chi2dist(k,x)
end

.p_value(pr, k) ⇒ `Object`

Return the P-value of the corresponding integral with k degrees of freedom



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# File 'lib/distribution/chisquare.rb', line 10

def p_value(pr,k)
    Statistics2.pchi2X_(k, pr)
end