Description Usage Arguments Value Examples
Extract item difficulties and item difficulty variance estimates for Rasch items from a fitted mirt object for one or two groups
1 | ExtractRaschMirt(mod, focal = NULL, reference = NULL)
|
mod |
A mirt object containing the fit of unidimensional model. |
focal |
Character. Required if mod is MultipleGroupClass, focal should coincide with the label for the focal group. If mod is SingleGroupClass, it is ignored. |
reference |
Character. Required if mod is MultipleGroupClass, reference should coincide with the label for the focal group. If mod is SingleGroupClass, it is ignored. |
If mod contains any itemtype == "Rasch", a list with the item parameters and the estimate covariances (if available). If mod is SingleGroupClass, the list contains the item parameters as a matrix and the covariances as a list. If mod is MultipleGroupClass, the list contains the item parameters and covariances for the focal and reference groups only.
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