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A sampling technique in which the population of interest is partitioned into subsets ("strata") based on characteristics known at all units before sampling.
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Stratified or multi-stage sampling?
I just started volunteering with a small organization that wants to estimate the average and total number environmental trouble spots in a large US city. They have a clear definition of an environment …
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Stratified or multi-stage sampling?
Looks like the answer is "Multi-stage Sampling." I found a great guide to this method, and the methods for calculating the average and total here: http://ecology.lifescience.ntu.edu.tw/course_932_ecol …