PORTLAND, Ore. (KOIN) — School is about to start for students in the Portland area and parents are getting their first look at what kind of schedules they can expect as distance learning continues.

If you specify the option METHOD=PPS, PROC SURVEYSELECT selects units with probability proportional to size and without replacement. The selection probability for unit i in stratum h equals n h Z hi .

Sampling is a tool researchers use for marketing, sociology or empirical study. In order for sampling to be productive, the data analysis must not be tainted. There are techniques for creating a ...