separate {lordif} | R Documentation |
Splits item response vectors of DIF items into separate group-specific vectors.
separate(resp, flag, gr)
resp |
a data frame (or matrix) of item response vectors |
flag |
a vector of DIF flags |
gr |
a vector of group identifiers |
To obtain group specific item calibrations, response vectors of DIF items are split into multiple vectors by group and treated as separate items.
Returns a data frame with item response vectors for non-DIF items followed by separated item response vectors for DIF items
Seung W. Choi <s-choi@northwestern.edu>
## ## Not run: separate(resp,flag,gr)