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C. C. Preston and A. M. Colman, “Optimal Number of Response Categories in Rating Scales: Reliability, Validity, Discriminating Power, and Respondent Preferences,” Acta Psychologica, Vol. 104, No. 1, 2000, pp. 1-15. http://dx.doi.org/10.1016/S0001-6918(99)00050-5

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