separate {lordif} | R Documentation |
splits item response vectors of DIF items by group
Description
Splits item response vectors of DIF items into separate group-specific vectors.
Usage
separate(resp, flag, gr)
Arguments
resp |
a data frame (or matrix) of item responses |
flag |
a vector of DIF flags |
gr |
a vector of group identifiers |
Details
To obtain group specific item calibrations, response vectors of DIF items are split into multiple vectors by group and treated as separate items.
Value
Returns a data frame with item response vectors for non-DIF items followed by separated item response vectors for DIF items
Author(s)
Seung W. Choi <choi.phd@gmail.com>
Examples
## Not run: separate(resp,flag,gr)
[Package lordif version 0.3-3 Index]