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优选词,正式主题词

Probability.Cluster.StratifiedRandomProbability: Cluster: Stratified random  

定义

  • The target population is divided into naturally occurring segments (clusters); next, these are divided into mutually exclusive strata and a random sample of clusters is selected from each stratum. Data are then collected from all units within each selected cluster. For example, for a sample of students in a city, schools would be divided into two strata by school type (private vs. public); schools would be then randomly selected from each stratum, and all of the students from every sampled school would be included.

URI

http://rdf-vocabulary.ddialliance.org/cv/SamplingProcedure/1.1.4/49f4571

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