Hi, I have a general question about using the SRS method of random sampling by strata. I am wondering if using SRS by Strata will automatically result in the random sampling to be evenly distributed within each strata. By this, I mean that all records within each strata will have equal probability in getting selected.    Example: I have 4 different groups identified by "ID" (1, 2, 3, 4). I have a file called SAMPSIZE to specify the number of samples I want to select from each group. If I use the proc surveyselect statement below, would the records within each strata ("ID") have an equal probability of being randomly selected? If not, how can this be done?   PROC SURVEYSELECT N=SAMPSIZE   METHOD=SRS   OUT=SAMPLES    DATA=POPULATION; STRATA ID; RUN;   Thanks! ... View more