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|Title:||Optimal Number of Response Categories in Rating Scales: Reliability, Validity, Discriminating Power, and Respondent Preferences|
|Authors:||Preston, Carolyn C.|
Colman, Andrew M.
|Citation:||Acta Psychologica, 2000, 104 (1), pp. 1-15.|
|Abstract:||Using a self-administered questionnaire, 149 respondents rated service elements associated with a recently visited store or restaurant on scales that differed only in the number of response categories (ranging from 2 to 11) and on a 101-point scale presented in a different format. On several indices of reliability, validity, and discriminating power, the 2-point, 3-point, and 4-point scales performed relatively poorly, and indices were significantly higher for scales with more response categories, up to about 7. Internal consistency did not differ significantly between scales, but test-retest reliability tended to decrease for scales with more than 10 response categories. Respondent preferences were highest for the 10-point scale, closely followed by the 7-point and 9-point scales. Implications for research and practice are discussed.|
|Description:||This is the author's final draft of the paper published as Acta Psychologica, 2000, 104 (1), pp. 1-15. The final version is available from www.sciencedirect.com. Doi: 10.1016/S0001-6918(99)00050-5|
|Appears in Collections:||Published Articles, School of Psychology|
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