stratified random sample

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In statistics, a modification of the random sample that is particularly useful when obvious heterogeneity exists in the community, area, etc. to be investigated. In such instances a simple random sample may fail to record sufficient replicates of a particular subcategory, or may do so only very inefficiently, so preventing a proper statistical monitoring of variability. In a stratified random scheme sample points are shared among the main types present, then allocated at random within those subcategories.

http://www.custominsight.com/articles/random-sampling.asp Explanation of the stratified random sample technique.

Subjects: Biological Sciences.

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