Re: combining scores from questions measuring the same construct but with different scales

Posted by Bruce Weaver on Nov 19, 2017; 9:01pm
URL: http://spssx-discussion.165.s1.nabble.com/combining-scores-from-questions-measuring-the-same-construct-but-with-different-scales-tp5735150p5735179.html

I believe Art is referring to paper #8 here:

   http://www.pbarrett.net/techpapers.html



Art Kendall wrote

> 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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