Question about "gamcdf" code

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Chris 2022 年 10 月 11 日
回答済み: Jeff Miller 2022 年 10 月 12 日
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) ?


Jeff Miller
Jeff Miller 2022 年 10 月 12 日
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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