χ2 cumulative distribution function and its complement.
Returns the area under the left hand tail (from 0 to x)
of the Chi square probability density function with
v degrees of freedom. The complement returns the area under
the right hand tail (from x to ∞).
χ2 cumulative distribution function and its complement.
Returns the area under the left hand tail (from 0 to x) of the Chi square probability density function with v degrees of freedom. The complement returns the area under the right hand tail (from x to ∞).
chiSqrDistribution(x | v) = ($(INTEGRATE 0, x) tv/2-1 e-t/2 dt ) / 2v/2 $(GAMMA)(v/2)
chiSqrDistributionCompl(x | v) = ($(INTEGRATE x, ∞) tv/2-1 e-t/2 dt ) / 2v/2 $(GAMMA)(v/2)