![]() ![]() A study of fish might stratify the groups according to size: The relationship between maturity and age of fish was studied by dividing the fish according to their lengths.Internal company surveys need to include proportionate amounts of people from each department: A company might want to stratify according to various departments while surveying the relationship between income levels and job satisfaction.Using geography as strata: The long-term psychological impact of abuse was studied among the general population where the population was stratified according to their geographical location.Using neighborhood characteristics as proportionate strata: Research conducted to determine the travel characteristics like frequency and mode of travel of a population used the characteristics of the residential areas as different strata.Based on the percentage of Hispanic households, the sampling area was separated into non-overlapping strata. Stratifying a sample population according to ethnicity: An analysis of social determinants of health and their correlation with obesity prevalence among a sample of Hispanics and non-Hispanic.Grouping shampoo users based on brand, to ensure you correct for over-representation of one brand in the study: For a market survey conducted to analyze the thoughts of people on the effectiveness of anti-hailfall shampoos, the respondent population can be grouped based on the brand of the product they use.If all the people in the survey were liberal, the results would surely be skewed and not representative of the whole population! Making sure a political focus group has proportionate numbers of people who vote for each party: While surveying the opinion of people on specific policies or political decisions, it can be beneficial to stratify based on the political affiliation of the respondents.You don’t want to just survey rich people or the results might be skewed! Ensuring people of all income brackets are represented in a taxation study: To study the impact of recent tax reforms, the population can be stratified into various segments according to their income levels as the tax laws and incentives are different for each income level. ![]() This way, you won’t have an over-representation of the Grade 7 students and under-representation of the Grade 8 students, for example. To avoid selection bias due to different grades having different subjects, the students can be grouped according to the grade, and students are chosen from each grade. Ensuring students from all grades are represented in a school study: Let’s say you need a sample of 100 from 1000 students who were asked about their preferred subject. ![]()
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