2016/11/16 by Karl Bang Christensen, Guido Makransky, Mike Horton · 1 citation
Computer Science · Decision Sciences · Mathematics · Psychology · #Advanced Statistical Modeling Techniques #Algorithm #Econometrics #Identification (biology) #Item response theory #Mathematics #Mental Health Research Topics #Polytomous Rasch model #Psychology #Psychometric Methodologies and Testing #Psychometrics #Rasch model #Residual #Statistics
paper · doi:10.1177/0146621616677520
openalex created_date 2016/10/28 · crossref issued 2016/11/16 · crossref published 2016/11/16 · crossref published-online 2016/11/16 · openalex publication_date 2016/11/16 · crossref created 2016/11/17 · crossref published-print 2017/05/01 · crossref deposited 2026/04/28 · crossref indexed 2026/08/04 · openalex updated_date 2026/08/04
The assumption of local independence is central to all item response theory (IRT) models. Violations can lead to inflated estimates of reliability and problems with construct validity. For the most widely used fit statistic Q 3 , there are currently no well-documented suggestions of the critical values which should be used to indicate local dependence (LD), and for this reason, a variety of arbitrary rules of thumb are used. In this study, an empirical data example and Monte Carlo simulation were used to investigate the different factors that can influence the null distribution of residual correlations, with the objective of proposing guidelines that researchers and practitioners can follow when making decisions about LD during scale development and validation. A parametric bootstrapping procedure should be implemented in each separate situation to obtain the critical value of LD applicable to the data set, and provide example critical values for a number of data structure situations. The results show that for the Q 3 fit statistic, no single critical value is appropriate for all situations, as the percentiles in the empirical null distribution are influenced by the number of items, the sample size, and the number of response categories. Furthermore, the results show that LD should be considered relative to the average observed residual correlation, rather than to a uniform value, as this results in more stable percentiles for the null distribution of an adjusted fit statistic.