# Manuals/calci/GAMMAINV

• is the probability value associated with gamma distribution
• & are the values of the shape and rate parameters.
• gives accurate value of the solution.
• is any positive integer.
• GAMMAINV(),returns the inverse of the gamma cumulative distribution.

## Description

• This function gives the inverse value of Cumulative Gamma Probability Distribution.
• This distribution is the Continuous Probability Distribution on the positive real line and it is of the reciprocal of a variable distributed according to the gamma distribution with two parameters & .
• It is used in Bayesian statistics.
• In , is the probability value associated with Gamma Distribution, is called shape parameter and is the rate parameter of the distribution.
• If , then .
• GAMMAINV use the iterating method to find the value of .
• Suppose the iteration has not converged after 100 searches, then the function gives the error result.
• This function will give the error result when
1.Any one of the arguments are non-numeric
2. or
3. or


## Examples

1. =GAMMAINV(0.65189,2,5) = 11.1335534510
2. =GAMMAINV(0.006867292,5,7) = 8.155481331
3. =GAMMAINV(0.1543869,9,3) = 18.0467153645
4. =GAMMAINV(1,9,3) = 82.51739521528073
5. =GAMMAINV(1.1,9,3) = NAN, because

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