[Rasch] Q3 index and local dependence

SR Millis srmillis at yahoo.com
Wed Mar 28 01:51:35 AEDT 2018

Thanks, Mike!
Could you provide some interpretive guidelines for identifying local dependence using Tables 23.1 and 23.99?
Scott R Millis, PhD, ABPP, CStat, PStat®
ProfessorDept of Physical Medicine & RehabilitationDept of Emergency Medicine
Wayne State University School of MedicineDetroit, MI  48201
Email: aa3379 at wayne.edu
Email: srmillis at yahoo.com
Tel: 313-993-8085 

   On Monday, March 26, 2018, 10:14:58 PM EDT, Mike Linacre <mike at winsteps.com> wrote: 
Q3 is the correlation between the raw residuals of pairs of items. These are listed, for instance, in Winsteps Table 23.99 with PRCOMP=R
Summarizing the Q3's across all items with PCA makes the dependency pattern clearer. See, for instance, Winsteps Table 23.1
Hope this help.
Mike L.
On 3/27/2018 10:38 AM, Bond, Trevor wrote:
 Dear Colleagues, It has been claimed that Yen’s Q3 index (1984) can be used to identify local dependence in Rasch analyses. 
e.g., Chou, Y.-T., & Wang, W.-C. (2010). Checking dimensionality in item response models with principal component analysis on standardized residuals. Educational and Psychological Measurement, 70(5), 717-731.
Christensen, K. B., Makransky, G., & Horton, M. (2017). Critical values for Yen’s Q3: Identification of local dependence in the Rasch model using residual correlations. Applied Psychological Measurement, 41(3), 178-194.
Have you used Q3 for that purpose? Do you know of papers that have adopted it? Is it helpful/effective? Is it available in the software that you use, or know about?
Looking forward to your advice and guidance.
Mike Linacre, mike at winsteps.com or winsteps1234 at gmail.com
Winsteps 4.0.1 and Facets 3.80.4 - www.winsteps.com
Concerned about aches, pains, youthfulness? Mike suggests Liquid Biocell ________________________________________
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