[Rasch] DIF studies for polytomous items

David Andrich david.andrich at uwa.edu.au
Fri Apr 9 11:20:51 EST 2010

Among other papers for practical examples you might look at

Hagquist, C. Andrich, D. (2004) Is the Sense of Coherence Instrument applicable on adolescents? a latent trait analysis using Rasch-modeling. Personality and Individual Differences. 36, 955-968.

Hagquist, C. and Andrich, D. (2004) Measuring subjective health among adolescents in Sweden: A Rasch-analysis of the HBSC.  Social Indicators Research, 68, 201 - 220.

David Andrich  BSc, MEd (UWA), PhD (Chic) FASSA
Chapple Professor
david.andrich at uwa.edu.au<mailto:david.andrich at uwa.edu.au>

Graduate School of Education
The University of Western Australia
M428, 35 Stirling Highway,
Western Australia , 6009

Telephone: +61 8 6488 1085
Fax: +61 8 6488 1052
CRICOS Code: 00126G
Pearson Psychometric Laboratory<blocked::http://www.education.uwa.edu.au/ppl>

From: rasch-bounces at acer.edu.au [mailto:rasch-bounces at acer.edu.au] On Behalf Of Kenji Yamazaki
Sent: Thursday, 8 April 2010 11:50 PM
To: rasch at acer.edu.au
Subject: [Rasch] DIF studies for polytomous items

Dear Colleagues,

I was wondering if anybody can point me to the information sources regarding differential item functioning studies for polytomous items.  Particularly, I would like to find the studies that utilized actual data rather than simulated ones.  What I am hoping to learn from these studies is the procedure for conducting a DIF study for polychromous items.  Particularly, I have a hard time understanding the analysis steps after I calibrate item difficulties and category threshold parameters separately for focal and reference groups.  Any suggestions will be greatly appreciated.


Kenji Yamazaki

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