The ideal method of selecting respondents within households is a probability method, but researchers seldom work under ideal conditions. They usually seek to improve within-unit coverage without adding to non-response. Probability selection methods, such as the Kish method, may enhance within-unit coverage but also may increase nonresponse because of the need for longer introductions, which are potentially intrusive and may alienate respondents. Longer surveys add to interviewer costs. Hagan and Collier developed a non-probability quota technique that they believed would secure respondent cooperation more readily because it asked no household composition questions. Their procedure was based on the Troldahl-Carter-Bryant (T-C-B) respondent selection method, which in turn was based on the Kish technique.

Interviewers are given four forms, which are randomly distributed. The result is an oversampling ...

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