GAMINV Function

Arguments

p

is a numeric probability.

Range:

0 p < 1

a

is a numeric shape parameter.

Range:

a > 0

The GAMINV function returns the p^th quantile from the gamma distribution, with shape parameter a. The probability that an observation from a gamma distribution is less than or equal to the returned quantile is p.

Note:   GAMINV is the inverse of the PROBGAM function.  

q1=gaminv(0.5,9);

8.6689511844

q2=gaminv(0.1,2.1);

0.5841932369

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