TY  - BOOK
AU  - Weese, James D. 
AU  - Turner, Ronna C. | Ames, Allison | Liang, Xinya | Crawford, Brandon 
TI  - The Development of a Standardized Effect Size for the SIBTEST Procedure  : (Journal Article)
SN  - 0022-0973
PY  - 2024///
CY  - Philadelphia, USA 
PB  - : Taylor and Francis Group and Routledge 
KW  -  DIF| differential item functioning| SIBTEST| standardized effect size
N1  - ***______{For Hard Copy, Please visit Library.}________***


N2  - Abstract: In this study a standardized effect size was created for use with the SIBTEST procedure. Using this standardized effect size, a single set of heuristics was developed that are appropriate for data fitting different item response models (e.g., 2-parameter logistic, 3-parameter logistic). The standardized effect size rescales the raw beta-uni value using a pooled variation that incorporates the beta-uni inclusion factor. Although the heuristics for the standardized and unstandardized effect sizes provide similar true-positive and false-positive rates in most conditions, the standardized effect size provides higher true-positive rates for conditions where item response variability is smaller in proportion to raw score differences. Inflated false-positive rates were solely impacted by smaller sample sizes, whereas larger sample sizes improved true-positive rates. An empirical application is provided to demonstrate how the standardized effect size provides for a more consistent comparison across items with varying response distributions. This study lays the foundation for the utilization of a standardized effect size for both dichotomous and polytomous item response models using the suite of SIBTEST procedures
UR  - https://doi.org/10.1080/00220973.2022.2141176
ER  -