[Rasch] I have about 80 items on depression and anxiety for which I have about 100 participants.
Michael Lamport Commons
commons at tiac.net
Mon Sep 20 14:33:05 EST 2010
I have about 80 items on depression and anxiety for which I have about
100 participants. I would like to choose a minimal set of items to test
for depression and possibly on a separate scale for anxiety. I plan to
factor the results and then do a Rasch on each dimensions separately.
Is the way to choose the best items -- the ones that have the least
variability in difficulty.-- is to choose roughly equally spaced items
with low in-fit and outfit scores, or what? We could get more participants
Michael Lamport Commons, Ph.D.
Assistant Clinical Professor
Department of Psychiatry
Harvard Medical School
Beth Israel Deaconess Medical Center
234 Huron Avenue
Cambridge, MA 02138-1328
Telephone (617) 497-5270
Facsimile (617) 491-5270
Cellular (617) 320--0896
Commons at tiac.net
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