The next sample design for the customer satisfaction survey uses stratification by State. The sampling frame is also sorted by Type and Usage before sample selection, to provide additional control ...

If you specify the option METHOD=PPS_SYS, PROC SURVEYSELECT selects units by systematic random sampling with probability proportional to size. Systematic sampling selects units at a fixed interval ...

Journal of Vegetation Science, Vol. 9, No. 2 (Apr., 1998), pp. 161-172 (12 pages) This paper aims at proposing efficient vegetation sampling strategies. It describes how the estimation of species ...