[Rasch] How much bias is too much?

Trudy Mallinson trudy.mallinson at usc.edu
Wed Jan 5 07:13:24 EST 2011

Hi All,

I am doing a FACETS analysis with items, patients, raters, and time.  I am interested particularly in rater bias. I've run the bias/interaction tables and excel plots.  Can someone please tell me, or point me to a citation for how I judge if there is "too much" bias -- that is, at what point do I decide that rater bias is detrimental to patient measurement?

Thanks for any thoughts or suggestions.

Trudy Mallinson, PhD, OTR/L, NZROT
Assistant Professor
University of Southern California
Division of Occupational Science and Occupational Therapy
1540 Alcazar Street, CHP 133, Room 101F
Los Angeles, CA 90089-9003
PH: (323) 442-2950
trudy.mallinson at usc.edu

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