DIFD: Stata module to evaluate test items for differential item functioning (DIF)

Laura Gibbons ()
Additional contact information
Laura Gibbons: General Internal Medicine, University of Washington

Statistical Software Components from Boston College Department of Economics

Abstract: DIF detection is a first step in assessing bias in test items. difd detects DIF in test items between groups, conditional on the trait that the test is measuring, using logistic regression. The criteria for DIF can be adjusted. Continuous and multilevel 'groups' are allowed. In addition to logged results, difd.dta has results and some model-checking statistics.

Language: Stata
Requires: Stata version 8.2
Keywords: testing; items; logistic regression; DIF (search for similar items in EconPapers)
Date: 2006-04-15, Revised 2009-03-28
Note: This module may be installed from within Stata by typing "ssc install difd". Windows users should not attempt to download these files with a web browser.

Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/d/difd.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/d/difd.hlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/d/DIF_PARSCALE.pdf documentation (application/pdf)

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Persistent link: http://EconPapers.repec.org/RePEc:boc:bocode:s456721

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