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

Bond, Trevor trevor.bond at jcu.edu.au
Fri Apr 22 07:52:58 EST 2011

 1.  That’s no problem Michael...you can combine RSM items and dichot items in one analysis in WinSteps
 2.  Look at Chap 5 in B&F 2nd – you eaxct issue is canvassed and XL spreadsheet provided

Best always

On 22/04/11 3:16 AM, "Michael Lamport Commons" <commons at tiac.net> wrote:

  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
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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>

 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?

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