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.

1 |

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

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