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Contents
module Distribution
# Calculate cdf and inverse cdf for Chi Square Distribution.
#
# Based on Statistics2 module
#
module ChiSquare
class << self
# Return the P-value of the corresponding integral with
# k degrees of freedom
def p_value(pr,k)
Statistics2.pchi2X_(k.to_i, pr)
end
# Chi-square cumulative distribution function (cdf).
#
# Returns the integral of Chi-squared distribution
# with k degrees of freedom over [0, x]
#
def cdf(x, k)
Statistics2.chi2dist(k.to_i,x)
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems