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tp4493530p4493530
2012 Mar 21
1
fwdmsa package: Error in search.normal(X[samp, ], verbose = FALSE) : At least one item has no variance
I'm using the fwdmsa package to identify deviant cases in a Mokken scale
analysis. I've run into a problem., separate from the one I posted
previously. The problem comes with items that are "easy" by IRT standards. A
good scale should include a range of difficulties; yet when I include "easy"
items in a forward search I continuously run into the problem that these
items