read.ip.icl {irtoys} | R Documentation |
Read in parameter estimates
Description
From ICL output, read in estimates of item parameters. Invoked automatically
when the model is estimated via irtoys
. If that is not the case,
file
must be a file produced with the write_item_param file
command in ICL.
Usage
read.ip.icl(file)
Arguments
file |
File name |
Value
A list with three elements, est
, se
, vcm
for the parameter
estimates, their standard errors, and the variance-covariance matrix per item.
Because ICL does not
compute standard errors, se
and vcm
will be NULL. est
is a matrix with
one row per item, and three columns: [,1] item
discrimination a
, [,2] item difficulty b
, and [,3] asymptote
c
. For the 1PL and 2PL models, all asymptotes are equal to 0; for the
1PL, the discriminations are all equal but not necessarily equal to 1.
Author(s)
Ivailo Partchev
[Package irtoys version 0.2.2 Index]