stratified sample

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Related to stratified samples: Stratified random sampling

strat·i·fied sam·ple

a subset of a total population, defined by some objective criterion such as age or occupation, is sampled.

stratified sample

See sample.
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Due to these issues, sample size in terms of number of clusters and items selected from each cluster should be greater than the sample size required for a simple random sample or stratified sample.
The first term of the variance equation is the variance of a stratified sample mean under proportional allocation.
A] represents the variance of an unstratified estimate or a stratified sample with fewer strata than the estimate of variance represented by [V.