item.stat {fsia} | R Documentation |
Item Statistics
Description
This function computes some statistics for each item.
Usage
item.stat(obj, columns, weights = FALSE)
Arguments
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. |
Value
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. |
Author(s)
Michela Battauz
See Also
Examples
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)
[Package fsia version 1.1.1 Index]