extract function

extracts IRT item parameters

Extracts IRT item parameter estimates from an output returned from mirt::mirt()

extract(ipar)

Arguments

• ipar: output from the mirt::mirt() function of the mirt package

Details

similar to the coef function in the mirt package

Returns

a data frame containing item parameter estimates in the order of a, cb1, cb2,..., cb(maxCat-1).

Author(s)

Seung W. Choi choi.phd@gmail.com

See Also

lordif, mirt::mirt()

Examples

##calib.sparse <- mirt(sparse.matrix,1,itemtype="gpcm") 
## Not run: ipar.sparse <- extract(calib.sparse)