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I have a similar question to Sample Size Calculation - Two Independent Means, in my case, I am measuring the number of orders our customer make which follows a gamma distribution I believe. How could I calculate the sample size?

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    $\begingroup$ What is your alternate hypothesis? Are you supposing, for instance, that the shape or rate parameters might differ as well as the means? If not--if you assume only a shift of location--then you are (a) contemplating a three-parameter Gamma family and (b) whether you need any special calculation (compared to the textbook Normal theory calculation) depends on how skewed that Gamma distribution is. Also, how will you be testing the difference of means? $\endgroup$ – whuber Aug 13 at 21:47

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