KB04: 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.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.