In equal probability sampling, each unit in the sampling frame, or in a stratum, has the same probability of being selected for the sample. PROC SURVEYSELECT provides the following methods that select ...

Systematic sampling using quadrats Sometimes scientists want to link the number of organisms they are sampling to an environmental factor.

An example of this is an investigation into whether the growth of seaweed depends upon the distance it is found on the seashore from the tide. We would use systematic sampling as we are looking to ...

In particular, two-dimensional extensions of known approximate variance estimators used in linear systematic sampling are introduced. These almost new variance estimators have the advantage of taking ...

The stratified random sample is always at least as accurate on the average as the random sample and its relative efficiency is a monotone increasing function of the size of the sample. No general ...