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module Distribution
module ChiSquare
module GSL_
class << self
def rng(k,seed=nil)
end
def pdf(x,k)
GSL::Ran::chisq_pdf(x.to_f,k.to_i)
end
# Return the P-value of the corresponding integral with
# k degrees of freedom
def p_value(pr,k)
GSL::Cdf::chisq_Pinv(pr.to_f,k.to_i)
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)
GSL::Cdf::chisq_P(x.to_f,k.to_i)
end
end
end
end
end
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