KB04: Kolen - Brennan (2004)

Description Usage Format Note Source


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.




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.


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


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

plink documentation built on May 1, 2019, 8:07 p.m.