stratified sampling


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Related to stratified sampling: random sampling, Systematic sampling, Cluster sampling

stratified sampling

[′strad·ə‚fīd ′sam·pliŋ]
(statistics)
A random sample of specified size is drawn from each stratum of a population.
References in periodicals archive ?
It is desired to determine if a random or stratified sampling plan would best assist in designing a control system for this production process.
This scenario was one of the principal reasons for the present study because a fixed stratified sampling plan would not be sensitive to these population shifts and thus, would not accurately represent the actual strata.
Because the placement of strata boundaries is critical for precise stratified estimates (Cochran, 1977), use of a stratified sampling design for a multispecies survey may result in only small gains in precision for some or all species.
Brown (1989) also compared simple versus stratified sampling methods and recommended a stratified logarithmic method for choosing accessions from the collection.
A stratified sampling strategy was employed to ensure racial and socioeconomic diversity among the participants, who ranged in age from 18 to 65 years.
The formulary agreement process is virtually identical to the stratified sampling process Indiana auditors use to determine audit assessments.
A 13-item survey was mailed to a stratified sampling of accredited dental schools that had affiliated dental hygiene educational programs (n=8).
If, however, the contamination site is known, or the purpose of the sampling is to determine the degree of decontamination achieved by a cleaning and disinfection, either judgmental sampling methods (clean versus soiled) or stratified sampling methods (timed sequence or measuring the degree of cleanliness) may be considered, with appropriate controls.
The trend table was established from a combination of pedological judgement and data from a structured stratified sampling program designed to `capture' the variation in soil properties as driven by elevation, aspect, and land system.
It has to rely on stratified sampling, buying the biggest and then a selection of the rest.
A stratified sampling scheme was developed in 1996 to monitor the population of this endemic snail.