Item Statistics
This function computes some statistics for each item.
item.stat(obj, columns, weights = FALSE)
obj |
An object containing the data imported by function |
columns |
A vector containing which columns to use. Columns can be specified by name or number. |
weights |
Logical. If TRUE weights are used to compute the score. |
A data frame with the following variables.
item |
item label. |
score |
total score for each item. If |
max |
maximum score for each item. |
perc |
ratio between score and max. |
Michela Battauz
data(test) data(key) data(weights) data(weights_multiple) testk <- addkey(test, keydata = key) testw <- addweights(testk, weightsdata = weights) testwm <- addweights(test, weightsdata = weights_multiple) # number of correct responses for each item ist <- item.stat(obj = testk, col = 2:41) head(ist) # sum of weights of correct responses for each item ist <- item.stat(obj = testw, col = 2:41, weights = TRUE) head(ist) # sum of weights of every response for each item ist <- item.stat(obj = testwm, col = 2:41, weights = TRUE) head(ist)
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