Hello, I am using the ppswr function to perform probability proportional to size sampling for a list of subjects, which returns the indices of the rows sampled from a given matrix (of census blocks). (e.g. 2,5,29,8, 29... rows 2, 5 and 8 are chosen once and row 29 is chosen twice for a particular subject). I would like to compare these indices returned from the ppswr function to the original table and add a new variable to the original table to indicate how many times a row was selected. The sampling procedure needs to happen once for each of 10,000 subjects, so must be within a loop. Advice appreciated! K [[alternative HTML version deleted]]