Question about "gamcdf" code

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Chris
Chris il 11 Ott 2022
Risposto: Jeff Miller il 12 Ott 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) ?

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Jeff Miller
Jeff Miller il 12 Ott 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
gaminv(0.75,1,2)
% ans = 2.7726
With a shape parameter of 1, this is the same as the exponential distribution:
expinv(0.75,2)
% ans = 2.7726

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