[Rasch] I have two very different instruments that I think measure the same thing.

Rense Lange rense.lange at gmail.com
Fri Apr 22 03:09:03 EST 2011


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>

>  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
> Facsimile   (617) 491-5270
> Cellular    (617) 320–0896Commons at tiac.nethttp://dareassociation.org/
>
>
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-- 
Rense Lange, Ph.D.
via gmail
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