Chi2cdf

Description

Computes the lower/upper tail probability for the $\chi^2$ distribution with real degrees of freedom df.

double prob = chi2cdf(double x, double df[, int tail])

Input, the value of the Chi variate, must be nonnegative ( $x>=0$ ).

Input, the degrees of freedom, $\nu$ , of the distribution, $\chi^2$ must be positive( $df>0$ ).

tail

Input, Optional. The tail probability type using for the $\chi^2$ distribution

prob

Output, the returned probability.

chi2cdf(150,3,1)=;     // ANS: 2.6349139284881E-32