[Rasch] Interpretation of Item Plot
PetroskiG at health.missouri.edu
Sat Mar 24 15:09:44 EST 2007
To keep the size of this e-mail small I put an item plot on PhotoBucket.
The item is ordinal with responses 0 to 4 with larger values indicating greater ability. Note that two of the five catagories do not ever have the highest probability of being endorsed. Am I correct in interpreting this as suggesting a defective item -- one that might work as well with only three categories?
U. of Missouri - Columbia
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