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

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)

Results