1. Random Sample Selection
http://analytics.ncsu.edu/sesug/2000/p-404.pdf
2.Selecting Unrestricted and Simple Random With Replacement Samples Using Base SAS and PROC SURVEYSELECT
http://support.sas.com/resources/papers/proceedings12/347-2012.pdf
3. Strata Sampling: built _NSIZE_ dataset
http://support.sas.com/resources/papers/proceedings09/058-2009.pdf
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