Elementary test-item analysis
Elementary analysis of the items in a test and the test sumscores based on Classical Test Theory.
tia(choices, key, ...)
choices |
The original responses to the items in the test: persons as rows, items as columns. May contain NA. |
key |
A vector containing the key (correct answers) to the items in
|
... |
Other parameters that may be passed to |
A list with three elements:
A list of statistics at test level (currently, only Cronbach's alpha, may be extended in future)
A matrix showing, for each item, the proportion of correct responses, the correlation with the sum score, and the alpha that the test would have if the item were dropped.
A matrix showing, for each possible choice in the multiple-choice item, the proportion of responses given, and the correlation with the sum score for the test (including the item). The correct response is highlighted with asterisks.
Ivailo Partchev
itemsum <- tia(Unscored, key=c(2,3,1,1,4,1,2,1,2,3,3,4,3,4,2,2,4,3))
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