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.
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kamerunicus per spikelet on the 3rd day of anthesis of male inflorescences, samples of spikelets were taken at 07:00, and 6 complete spikelets were subjected to stratified sampling every hour (every half an hour during the active peak period of E.
Usual two-phase ratio and product estimators are defined in stratified sampling respectively as,
“Bootstrap Monte Carlo Using Adaptive Stratified Sampling for UQ/V&V of Large Structures Subject to Shock Loading,” by Dr.
Allocation with more than one characteristic in stratified sampling is conflicting in nature, because the best allocation for one characteristic will not, in general, be best for others.
Individual chapters discuss basic tools; simple and stratified sampling; cluster sampling; graphics; ratios and linear regression; categorical data regression; post-stratification, raking, and calibration; two-phase sampling; missing data; and causal inference.
Probability sampling weights were applied to all analyses to account for multistage stratified sampling methodology.
The sampling method chosen was the random stratified sampling, which consist of: dividing the collectivity in groups based on preset criteria--incomes (125-1000E) and age (18-60 years), from every group (50 subjects) were randomly extracted a sample which was interviewed.
The review was conducted across Cyprus in a final sample of 969 internet users, aged 13 years and above, with the methodology of random multistage stratified sampling. The data was collected through telephone interviews from October 23 until November 6.
Future assessments will result in a stratified sampling technique; to ensure research integrity, a survey response rate adequate to conduct analyses and make conclusions at the 95 percent level of confidence is needed.