GAMINV Function

GAMINV Function

Returns a quantile from the gamma distribution

Category: Quantile

Syntax

GAMINV ( p,a )

Arguments

p

• is a numeric probability.

• Range: ‰ p <1

a

• is a numeric shape parameter.

• Range: a > 0

Details

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.

Examples

SAS Statements	Results
q1=gaminv(0.5,9);	8.6689511844
q2=gaminv(0.1,2.1);	0.5841932369