[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 
wrong

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
Facsimile   (617) 491-5270
Cellular    (617) 320–0896
Commons at tiac.net
http://dareassociation.org/




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 ...
>
> Rense
>
> 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>
>     http://dareassociation.org/
>
>
>
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>
>
>
> -- 
> Rense Lange, Ph.D.
> via gmail
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