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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 igami
ERROR MESSAGES:
message condition value returned
domain y < 0 or y > 1 0.0
v < 1