層化抽出法
1. Stratified samplingIn statistics, stratified sampling is a method of sampling from a population. In statistical surveys, when subpopulations within an overall population vary, it is advantageous to sample each subpopulation (stratum) independently. Stratification is the process of dividing members of the population into homogeneous subgroups before sampling. The strata should be mutually exclusive: every element in the population must be assigned to only one stratum.
Read “Stratified sampling” on English Wikipedia
Read “層化抽出法” on Japanese Wikipedia
Read “Stratified sampling” on DBpedia
Read “Stratified sampling” on English Wikipedia
Read “層化抽出法” on Japanese Wikipedia
Read “Stratified sampling” on DBpedia
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