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

Value

A list with two elements, est and se, for the parameter estimates and their standard errors, correspondingly. Because ICL does not compute standard errors, se 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

Results