This dataset includes multidimensional two parameter logistic model (M2PL) item parameter estimates for two dimensions and two groups. The Form 1 items are from a "new" form and the Form 2 items are from an "old" form. There are 16 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 80 x 3 matrix of item parameters. Element
one is for
Form 1, and element two is for
Form 2. The first two columns
in each matrix are for the slope parameters and the third column is for the parameter
related to item difficulty.
The second list element in
reckase9 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$form1 that are common items.
The second column identifies the corresponding set of common items in
Reckase, M. D. (2009). Multidimensional item response theory. New York: Springer.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.