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Wang, Rui; Krosnick, Jon A. – International Journal of Social Research Methodology, 2020
Questionnaires routinely measure unipolar and bipolar constructs using rating scales. Such rating scales can offer odd numbers of points, meaning that they have explicit middle alternatives, or they can offer even numbers of points, omitting the middle alternative. By examining four types of questions in six national or regional telephone surveys,…
Descriptors: Validity, Rating Scales, Questionnaires, Telephone Surveys