I can't locate the textbook that was on my shelf that explained this, but the equal intervals also result from the fact that a true Likert scale is a summative scale, made up of a number of items that, together, are internally consistent.
 
 
Michael T. Scoles, Ph.D.
Associate Professor of Psychology & Counseling
University of Central Arkansas
Conway, AR 72035

>>> [EMAIL PROTECTED] 9/30/2005 8:32 AM >>>
Concerning Likert scales:  I make a point of telling students that Likert
actually scaled the category labels he used.  If the general format is used
(1-5) but no scaling has been done to determine the anchors, I would prefer
that students refer to this as a "Likert-type" scale.  Likert scaled the
anchors so as to approximate equal intervals.

Dr. James Thomas, Psychology Department, University of Nebraska at Omaha.
([EMAIL PROTECTED])


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