read.ip.bilog {irtoys} | R Documentation |
From BILOG 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 >SAVE PARm file;
command in BILOG.
read.ip.bilog(file)
file |
File name |
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