stratified sample

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Related to stratified sampling: random sampling, Systematic sampling, Cluster 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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On the auxiliary variable, the usual two-phase product estimators for population mean are defined in stratified sampling respectively as,
The three step approach that the software requires to perform the Monte Carlo simulation for stratified sampling plan is as follows:
Combining this ability to adjust sampling stratification with the established method of optimized stratified sampling, the majority of the sample effort can be targeted to the strata likely to have the highest variability in density and most likely the nuisance levels.
With poststratification, sample sizes within strata are random variables--which are an additional source of variability over that of a stratified sampling variance estimator (Thompson, 1992; Scheaffer et al.
The D method may be useful not only for sampling genetic diversity in crop germplasm collections but also in other areas of research where a stratified sampling method is required for preserving as much of the original population's diversity as possible.
An additional 16 sites were sampled using the structured stratified sampling pattern (McIntosh et al.
Using a size of operation and geographic stratified sampling plan, Doane surveyed more than 800 producers quarterly about their use of anthelmintic, pharmaceutical, vaccine and feed medication/additive products.
Jurors are selected in one of three ways: random sampling, representative sampling, or stratified sampling.
If we know something in advance about the population and use it to partition items into various layers or strata, then stratified sampling is more efficient than simple random sampling.
Stratified sampling is a procedure that splits the population of transactions into "strata" or levels.
HS&B originally followed a two-stage stratified sampling plan, where a fixed number of students in their sophomore and senior years (about 36 of each) was randomly selected in each of a random sample of about 1,000 high schools.
For QC applications under each state, random or stratified sampling represents the two most commonly used sampling methods.