read.ip.bilog: Read in parameter estimates

In lebebr01/irtoys-2: Simple interface to the estimation and plotting of IRT models

Description

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.

Usage

  read.ip.bilog(file)

Arguments

file

File name

Value

A list with two elements, est and se, for the parameter estimates and their standard errors, correspondingly. Each element 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

lebebr01/irtoys-2 documentation built on May 20, 2019, 11:29 p.m.