verb · academic
stratify
/ˈstrætɪfaɪ/STRAT·i·fy
to divide a sample or population into subgroups (strata) based on characteristics
Examples
“The sample was stratified by age group to ensure each cohort was represented.”
“Researchers often stratify participants by gender and income in social surveys.”
“We stratified the data before calculating prevalence within each stratum.”
Band 8 sentence
“To reduce sampling error, the investigators stratified the population by socioeconomic status before selecting proportional samples from each stratum.”
Collocations
- stratify by age/gender
- stratified sampling
Word family
Common mistakes
They stratify sample by age.→They stratify the sample by age.
We stratify participants into three groups then analyse.→We stratify participants into three groups, then analyse.
Stratify always means to split into three groups.→Stratify means to split into meaningful subgroups; the number can vary.
Say it for a higher band
5divide→6group→7+stratify
Synonyms
divide
Easily confused
randomize
“To avoid selection bias, researchers randomized participants into treatment and control groups.”
Related words
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In Science & Research
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