distractors {classicaltest} | R Documentation |
Distractor statistics
Description
Summarize the statistics for each category of each item.
Usage
distractors(
x,
key,
wt = NULL,
navalue = NA,
itemcategories = NULL,
administered = NULL
)
Arguments
x |
a data frame or matrix. |
key |
a vector or a list indicating the keys to score the data. If answers can only be right or wrong use a vector. If partial credits are allowed, use a list where the first element contains the keys for full credits, and next elements contain progressively the partial credit information. If a test has a combination of full credit and partial credit items, leave the full credit items as NAs in the keys for partial credit. |
wt |
a vector with total weights. Default is |
navalue |
a single value indicating the score of NAs. |
itemcategories |
a vector indicating all the possible categories for all items. If NULL, possible categories will be derived from data. |
administered |
a logical matrix indicating which items were administered.
The dimensions should be the same as |
Value
a list.
Examples
# Full credit items
distractors(x = dichodata, key = dichokey)
# Partial credit items
distractors(x = partialdata, key = partialkey)