Searches the item bank for matching items, and returns the difficulty estimates. Matching is done by item name. Comparisons are done in lower case.
A character vector containing names of items to be
included into the D-score calculation. Milestone scores are coded
A string that sets the key, the set of difficulty
estimates from a fitted Rasch model.
The built-in keys are:
A named vector with the difficulty estimate per item with
Stef van Buuren 2020
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