extract {lordif}

extracts IRT item parameters

Description

Extracts IRT item parameter estimates from an output returned from mirt

Usage

  extract(ipar)

Arguments

ipar

output from the mirt function of the mirt package

Details

similar to the coef function in the mirt package

Value

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

Author(s)

Seung W. Choi <[e-mail]>

See Also

lordif, mirt

Examples

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