![]() ![]() They are helpful to those of us who wish to investigate DIF, and we remain grateful to them.įree differential item functioning software available on the internet I would thank the authors of these programs for allowing free access to these packages. ![]() In addition, at the time of this writing, several DIF software packages are available for free on the Internet. ![]() Camilli and Shepard (1994) and Zumbo (1999) provided some code for conducting DIF analyses in SPSS, and some code for conducting a logistic regression DIF analysis using SPSS is provided in this Appendix. Several software packages are available for conducting differential item functioning (DIF) analyses, and many analyses can be done using standard statistical software packages such as SAS or SPSS.
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