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Question about "gamcdf" code

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Chris on 11 Oct 2022
Answered: Jeff Miller on 12 Oct 2022
The scale parameter is 2 and shape parameter is 1. I want to use "gamcdf" code for 75th percentile value, then do I have to use gamcdf(75,2,1) or gamcdf(0.75,2,1) ?

Accepted Answer

Jeff Miller
Jeff Miller on 12 Oct 2022
To get the 75th percentile value, you need to use gaminv() rather than gamcdf. Also, the shape parameter comes first and scale second. So, you want
% ans = 2.7726
With a shape parameter of 1, this is the same as the exponential distribution:
% ans = 2.7726

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