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Posted 05-09-2017 02:36 PM
(1929 views)

If I know the population size (such as 10,0000 records), and I set the confident level to be 90%, upper error limits to be 7%, expected error rate to be 2%. Can I use proc power to calcuate the sample size. It seems to me this is an attribute sample size determination, not parametric one.

Thanks for your help.

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What ballardw is saying is that determining the sample size that is required to get a significant result with a specified probability DEPENDS on the analysis that you are conducting. Are you planning to do an ANOVA? A two-sample t-test for means or proportions? Tell us what statistical test you plan to run.

You might like to read this overview of power and sample size computations, which gives a lot of useful background information.

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You keep saying the same thing, but the example you give doesn't seem to conform to the usual definition of sample size determination.

I don't think it is possible to do what you are asking for. It sounds like you want to find a sample size N such that you can test future samples of size N (non-parametrically?) against an original sample and conclude that the distributions come from the same population.Testing whether two samples come from the same population is one of the fundamental issues in statistics. There are dozens of tests that you can choose from to determine that "they are the same". You can use tests to compare means, medians, variances, rank-sums, and more. However, you HAVE to specify a test because each test has a different power.

Good luck.

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