CBS News Monthly Poll and Call-Back, August 1993
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A variation of random-digit dialing using primary sampling units (PSUs) was employed, consisting of blocks of 100 telephone numbers identical through the eighth digit and stratified by geographic region, area code, and size of place. Within households, respondents were selected using a method developed by Leslie Kish and modified by Charles Backstrom and Gerald Hursh (see Backstrom and Hursh, SURVEY RESEARCH [Evanston, IL: Northwestern University Press, 1963]). For the call-back survey, 621 of the original respondents were recontacted.
创建时间：
2023-06-28
