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 response vectors
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 <s-choi@northwestern.edu>

See Also

lordif

Examples

##
## Not run: separate(resp,flag,gr)

[Package lordif version 0.1-4 Index]