extract {lordif} | R Documentation |
extracts IRT item parameter estimates from an output returned from ltm:grm
extract(ipar)
ipar |
output from the grm function in the ltm package |
similar to the coef function in the ltm package
a data frame containing item parameter estimates in the order of a, cb1, cb2,..., cb(maxCat-1).
Seung W. Choi <s-choi@northwestern.edu>
##calib.sparse <- grm(sparse.matrix,constrained=FALSE,IRT.param=TRUE) ## Not run: ipar.sparse <- extract(calib.sparse)