13.3 Alternative Sampling Methods
Stratified and Cluster Samples
Simple random samples are easy to use. Later chapters assume that data are from an SRS. Most commercial polls and surveys like those you see on the news, however, are more complex. There’s a reason for the complexity: to save time and money. Though more complex, all sampling designs share the idea that random chance, rather than personal preference, determines which members of the sampling frame appear in the sample.
Surveys that sample large populations are typically more complicated than simple random samples. A stratified random sample divides the sampling frame into subsets, called strata (singular stratum), before the sample is selected. Simple random sampling is used to pick ...
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