cat_clps {IRTest}

A recommendation for category collapsing of items based on item parameters

Description

In a polytomous item, one or more score categories may not have the highest probability among the categories in an acceptable \theta range. In this case, the category may possibly be regarded as redundant in a psychometric point of view and can be collapsed into another score category. This function returns a recommendation for a recategorization scheme based on item parameters.

Usage

cat_clps(item.matrix, range = c(-4, 4), increment = 0.005)

Arguments

item.matrix

A matrix of item parameters.

range

A range of \theta to be evaluated. The default is c(-4, 4).

increment

A width of the grid scheme. The default is 0.005.

Value

A list of recommended recategorization for each item.

Author(s)

Seewoo Li [e-mail]