[Rasch] I have two very different instruments that I think measure the same thing.
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
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
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>
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?
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Rasch