stratified sample
1
5.4
- noun
- /ˈstrætɪfaɪd ˈsæmpl/
- Specialized
- Brochures were randomly distributed to a stratified sample of homeowners in three urban areas in Michigan.
- a multistage stratified sample
- a random stratified sample
- using a stratified sample
Examples
-
Using the Quality Education database, which lists all high schools in the United States, the researchers selected a stratified sample of 80 high schools with probability proportionate to size.
Academic text (2003) -
Schools were selected from a stratified sample to vary in location, proximity to Indian reservations, size, and type.
Academic text (2011) -
In addition, the respondents appropriately represented the stratified sample of the target population.
Academic text (1996) -
In order to compare this sample to lay senior faculty and senior administration, a random stratified sample was drawn from each of the two groups.
Academic text (2010) -
The questionnaire is the survey of a random stratified sample of parents of pupils of different grade levels in Taiwan.
Academic text (2012) -
ABSTRACT. A stratified sample of 238 female business graduates in Singapore provided the data for this study.
Academic text (1992) -
A stratified sample of 403 usable surveys was obtained.
Academic text (2013) -
In addition, chi-square analysis indicated that the respondents appropriately represented the stratified sample in each geographical area.
Academic text (1999) -
TEPS is a survey using a multistage stratified sample of Taiwanese secondary school and junior college students.
Academic text (2009) -
The researchers conducted a survey using a stratified sample of different age groups to ensure diverse representation.
Synonyms
1
6.5
To choose people by dividing them into groups and picking random people from each group
How Representative
- Specialized
5
4.4
- Specialized
1
5.4
- Specialized
24
3.6
- Specialized
7
3.4
- Specialized
Surface Forms
Morphology
The meaning ('a sample drawn from a population divided into subgroups') is directly derivable from combining 'stratify' (to divide into layers/groups) with 'sample' (a portion taken for study). The adjective 'stratified' simply indicates the sample was produced by stratification, a regular modifier+noun composition that is cross-linguistically common and predictable for a learner who knows both constituents.
Etymology
The term stratified sample comes from the image of layers, like a cake, where stratified means 'in layers' and a sample is a small group chosen from a larger one. So researchers pick people from each 'layer' to make sure the sample includes all important groups.