[Rasch] Number of scale points

Donald Bacon dbacon at du.edu
Wed Aug 8 02:58:36 EST 2012

Hi Rasch gurus -

   I remember reading a paper a while back that made the point that long scales, e.g., 100 point scales, were not particularly useful because responses would tend to cluster around simpler numbers.  For example, you might see many responses of exactly 70 or 80, but few responses of exactly 73 or 86.  Now I can't remember where I read this.  Does anyone have a good cite for me?

Thanks -


Donald R. Bacon, Ph.D.
Professor of Marketing
Editor, Journal of Marketing Education
Daniels College of Business
University of Denver

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