Simon Fraser University

Stratified Sampling with Control Sorting

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 ...
JSTOR Daily

Relative Accuracy of Systematic and Stratified Random Samples for a Certain Class of Populations

This is a preview. Log in through your library . Abstract A type of population frequently encountered in extensive samplings is one in which the variance within a group of elements increases steadily ...
Simon Fraser University

Systematic Random Sampling

The method of systematic random sampling (METHOD=SYS) selects units at a fixed interval throughout the sampling frame or stratum after a random start. PROC SURVEYSELECT chooses the first unit randomly ...
BBC

Using quadrats in sampling

These are placed on the ground to look at the plants or slow-moving animals within them. When looking at plants in a quadrat, the following sampling can be used: Random close randomOccurring without a ...