A sample that is grouped according to a dimension believed to be important, such as race, sex or age. The sample is then drawn separately for each group.

probability sampling method in which the population is first divided into groups or strata on the basis of one or more characteristics of interest.

involves dividing the population of interest according to a common characteristic or attribute, then conducting a probability sample within each group (180)

A sampling technique designed to divide the population into segments (strata) and randomly sample from each stratum.

the population is divided into subpopulations (strata) and random samples are taken of each stratum

The population is divided into subgroups of interest and then sampled within these groups. This could be used to ensure that the sample is representative of the relative size/value of the subgroups.

An experimental procedure in which each subgroup of the population is sampled in proportion to its size.

A sampling method in which the population of interest is divided according to a common characteristic or attribute and a probability sampling is then conducted within each group

a random selection made from different sub-groups within the population.

In statistics, stratified sampling is a method of sampling from a population.