[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?
Thanks!
Scott 
~~~~~~~~~~~
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: 
 
   Trevor:
 
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.
 
Collegially
 
Trevor
 
 
 
 -- 
Mike Linacre, mike at winsteps.com or winsteps1234 at gmail.com
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