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Probabilities.StudentCDFInv Function

Student distribution point percent function (PPF).

Pascal
function StudentCDFInv(p: double; Nu: Integer): double; overload;
Parameters 
Description 
Probability, real positive value on closed interval [0,1]. 
Nu 
Defines distribution degrees of freedom, positive integer. 

the Student distribution point percent function (PPF) for probability p using the integer parameter Nu (degrees of freedom). Parameter Nu must be positive integer number and probability p must lie on the interval [0,1], otherwise the result is NAN.

function StudentCDF(x :single; Nu: Integer): single; overload;  

The inverse Student cumulative distribution function is defined by the following equation: 

 

The result of StudentCDFInv is the solution of the integral equation of the StudentCDF with parameter Nu where you must specify the probability p.

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