[Rasch] I have two very different instruments that I think measure the same thing.
Michael Lamport Commons
commons at tiac.net
Fri Apr 22 03:16:48 EST 2011
They are of different forms. One is on a 1-6 scale, the other right and
Michael Lamport Commons, Ph.D.
Assistant Clinical Professor
Department of Psychiatry
Beth Israel Deaconess Medical Center
Harvard Medical School
234 Huron Avenue
Cambridge, MA 02138-1328
Telephone (617) 497-5270
Facsimile (617) 491-5270
Cellular (617) 320–0896
Commons at tiac.net
On 4/21/2011 1:09 PM, Rense Lange wrote:
> Why not scale them (both tests = all items) together? If they really
> measure the same thing, everything should fit. And, in this case you
> just have defined a more reliable test of the construct.
> No problem if some items don't fit, then you learned something useful
> also ...
> 2011/4/21 Michael Lamport Commons <commons at tiac.net
> <mailto:commons at tiac.net>>
> I have two very different instruments that I think measure the
> same thing. What tests do you think would be useful in comparing
> person scores. Note that the means will be close but the standard
> deviations might be more different. Should a simple t-test do?
> My Best,
> Michael Lamport Commons, Ph.D.
> Assistant Clinical Professor
> Department of Psychiatry
> Beth Israel Deaconess Medical Center
> Harvard Medical School
> 234 Huron Avenue
> Cambridge, MA 02138-1328
> Telephone(617) 497-5270 <tel:%28617%29%20497-5270>
> Facsimile(617) 491-5270 <tel:%28617%29%20491-5270>
> Cellular (617) 320–0896
> Commons at tiac.net <mailto:Commons at tiac.net>
> Rasch mailing list
> Rasch at acer.edu.au <mailto:Rasch at acer.edu.au>
> Rense Lange, Ph.D.
> via gmail
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