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.

Systematic sampling is very convenient in many practical situations, but does not provide a satisfactory estimator of the variance of the sample mean except when additional assumptions are made. A ...

A simple random sample is a subset of a statistical population where each member of the population is equally likely to be chosen.

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 ...