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Response Effects in Surveys on Children and Adolescents: The Effect of Number of Response Options, Negative Wording, and Neutral Mid-Point[J] . Natacha Borgers,Dirk Sikkel,Joop Hox.Quality and Quantity . 2004 (1)
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Optimal number of response categories in rating scales: reliability, validity, discriminating power, and respondent preferences[J] . Carolyn C Preston,Andrew M Colman.Acta Psychologica . 2000 (1)