Searches the item bank for matching items, and returns the difficulty estimates. Matching is done by item name. Comparisons are done in lower case.
get_tau(items, key = "gsed", itembank = dscore::builtin_itembank)
items | A character vector containing names of items to be
included into the D-score calculation. Milestone scores are coded
numerically as |
---|---|
key | A string that sets the key, the set of difficulty
estimates from a fitted Rasch model.
The built-in keys are: |
itembank | A |
A named vector with the difficulty estimate per item with
length(items)
elements.
Stef van Buuren 2020
#> ddifmd001 DDigmd052 xyz #> 5.51 NA NA