chdtri

Inverse of complemented Chi-square distribution.

SYNOPSIS:

double df, x, y, chdtri();
x = chdtri(df, y);

DESCRIPTION:

Finds the Chi-square argument x, such that the integral from x to infinity of the Chi-square density is equal to the given cumulative probability y.

This is accomplished using the inverse gamma integral function and the relation:

    x/2 = igami(df/2, y);

ACCURACY:

See the igami Help topic.

ERROR MESSAGES:

   message          condition       value returned
   domain         y < 0 or y > 1         0.0
                  v < 1

请注意 : 本帮助页面不适用于最新版本的Enterprise Architect. 最新的帮助文档在这里.

chdtri