Posted by
Art Kendall on
Nov 19, 2017; 3:35pm
URL: http://spssx-discussion.165.s1.nabble.com/combining-scores-from-questions-measuring-the-same-construct-but-with-different-scales-tp5735150p5735178.html
This paper uses Statistica. If someone has the time, I might make a good
teaching and planning tool to do the simulation in SPSS with provision for
inputting pop R in the ranges for the discipline. One run would use a huge
number of cases, others would use numbers of cases common in the discipline.
In my experience, in most pretests of administrations people can usually
deal with 7 categories, although there have been a few situations where they
could always deal with 5 categories. YMMV.
a rule of thumb I would suggest is:
in the first development of an instrument use as many categories as the
pre-tests shows people from the relevant population can deal with.
Another rule of thumb is to use the response categories of an instrument
developed by others UNLESS administration pre-tests show the relevant
population can only deal with a smaller number.
Can anybody think of situations where these rules of thumb would be
contr-indicated?
-----
Art Kendall
Social Research Consultants
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Art Kendall
Social Research Consultants