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See also: tDistriQuantile, tDistriDensity 

tDistriIntegral

Declaration: tDistriIntegral (t: double; df: integer): double;
The function tDistriIntegral returns the integral of the t-distribution between minus infinity and the value of the parameter t. The parameter df specifies the number of degrees of freedom. The returned value may vary between 0.0 and 1.0.