KB04 {plink}

Kolen - Brennan (2004)

Description

This (unidimensional) dataset includes three parameter logistic model (3PL) item parameter estimates for two groups. The Form X items are from a "new" form and the Form Y items are from an "old" form. The data are listed in Table 6.5 in Test Equating, Scaling, and Linking (2nd ed.). There are 12 common items between the two forms.

Usage

KB04

Format

A list of length two. The first element pars is a list of length two. Each of the list elements in pars is a 36 x 3 matrix of item parameters. Element one is for Form X, and element two is for Form Y.

The second list element in KB04 is a matrix identifying the common items between the two sets of parameters in pars. That is, the first column in common identifies the rows in pars$form.x that are common items. The second column identifies the corresponding set of common items in pars$form.y.

Note

In the book, the authors transform the Form X parameters to the Form Y scale.

Source

Kolen, M. J., & Brennan, R. L. (2004) Test Equating, Scaling, and Linking. (2nd ed.), p. 192 New York: Springer