read.ip.icl | R Documentation |
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.
read.ip.icl(file)
file |
File name |
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.
Ivailo Partchev
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