I have 50 states in my sample frame. Also I have ANOTHER constraint that needs to be included. So just to be clear, let me repeat my problem once again (with the additional constraint). 1. My sample frame has 50 states and zip codes that end with 0 through 9. Firstly, I want to randomly sample 100 observations (10 subgroups of 10 observations each) based on their zip code. (First subgroup of 10 observations has zip code ending with 0, second subgroup has zip code ending with 1, etc.) 2. Second constraint (with the new constraint) is that I want at most 5 observations from state1, at most 3 observations from state2 and all other states must be included less than 2. This is the stage that I am having a problem. Thanks again for your help.
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