stratified random sample

American  

noun

Statistics.

1. a random sample of a population in which the population is first divided into distinct subpopulations, or strata, and random samples are then taken separately from each stratum.

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Example Sentences

“The calling list was a stratified random sample, drawn from a list of all Protestant churches,” the group said.

From Washington Times

Then, the researchers randomly selected 35 households in each populated barrio, creating a stratified random sample.

From Nature

Liaisons contact an additional “stratified random sample” of law enforcement agencies of various sizes that were not associated with any report of an arrest-related death, to see whether any of them have in fact had such an incident.

From The Guardian

A “voluntary response sample” is generally regarded as socially acceptable, whereas a “stratified random sample” can land you in jail.

From Slate

The survey’s local results are based on interviews with 100 CFOs from a stratified random sample of companies in the Chicago area with 20 or more employees.

From Chicago Tribune