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module Distribution
module T
module GSL_
class << self
def pdf(x,k)
GSL::Ran.tdist_pdf(x,k)
end
# Return the P-value of the corresponding integral with
# k degrees of freedom
#
# Distribution::F.p_value(0.95,1,2)
def p_value(pr,k)
GSL::Cdf.tdist_Pinv(pr,k)
end
# F cumulative distribution function (cdf).
#
# Returns the integral of F-distribution
# with k1 and k2 degrees of freedom
# over [0, x].
# Distribution::F.cdf(20,3,2)
#
def cdf(x, k)
GSL::Cdf.tdist_P(x.to_f, k)
end
end
end
end
end
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