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stratifies
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The answer STRATIFIES has 0 possible clue(s) in existing crosswords.
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Definitions of stratifies in various dictionaries:
verb - divide society into social classes or castes
verb - form layers or strata
verb - develop different social levels, classes, or castes
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In statistics, stratified sampling is a method of sampling from a population.* In statistical surveys, when subpopulations within an overall population vary, it could be 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. The strata should also be collectively exhaustive: no population element can be excluded. Then simple random sampling or systematic sampling is applied within each stratum. The objective is to improve the precision of the sample by reducing sampling error. It can produce a weighted mean that has less variability than the arithmetic mean of a simple random sample of the population. * In computational statistics, stratified sampling is a method of variance reduction when Monte Carlo methods are used to estimate population statistics from a known population. |