The Effects of Distractors to Differential Item Functioning in Peabody Picture Vocabulary Test
Abstract
In this study logistic regression and Lord’s Chi Square methods were used to research the items that have DIF. The study utilized Peabody Picture Vocabulary Test (PPVT). The original form of the PPVT includes four options. Three different forms (A, B and C) were formed by removing one of the distractors respectively. The original form of PPVT was implemented in a group of 970 preschool children who were aged between 3 to 6. 757 of them took one of the forms. In each implementation, the order to the implementation of the original form and the form (A, B or C) was changed. The applications were conducted 15 days apart. In the first application, the original form was applied, while one of the devised forms (A, B or C) was used in the following application. In this way, the effect of order of application on responses was investigated. The gender variable constituted the reference and focus group of the study. The Logistic Regression and Lord's Chi-square methods did not give compatible results in DIF analysis. DIF was found in 15 items in the original form according to the logistic regression method and in nine items according to the Lord's Chi-square method. The three-option and four-option applications of the test revealed that DIF was determined in five items in different forms. It was observed that there was no compliance in different applications and analyses in other items with DIF.
Keywords
References
- Adebule, S. O. (2013). A Study of Differential Item Functioning in Ekiti State Unified Mathematics Examination for Senior Secondary Schools. Journal of Education and Practice, 4(17), 43-46.
- Alordiah, C. O., & Agbajor, H. T. (2014). Bias in test items and implication for national development. Journal of Education and Practice, 5(9), 10-13.
- Allalouf, A. (2003). Revising translated differential item functioning items as a tool for improving cross-lingual assessment. Applied Measurement in Education, 16(1), 55-73.
- Clauser, B. E., & Mazor, K. M. (1998). Using statistical procedures to identify differentially functioning test items. Educational Measurement: issues and practice, 17(1), 31-44.
- Doğan, N., & Öğretmen, T. (2010). Değişen madde fonksiyonunu belirlemede mantel‐haenszel, ki‐kare ve lojistik regresyon tekniklerinin karşılaştırılması. Eğitim ve Bilim, 33(148), 100-112.
- Dunn, L. M., & Dunn, L. M. (1981). Manual for the Peabody picture vocabulary test - revised. Circle Pines, MN: American Guidance Service.
- French, B. F., & Maller, S. J. (2007). Iterative purification and effect size use with logistic regression for differential item functioning detection. Educational and Psychological Measurement, 67(3), 373-393.
- French, B. F., Maller, S. J., & Zumbo, B. (2007). The influence of differential item functioning on multi-sample confirmatory factor analysis. In National Council on Measurement in Education conference, Chicago, IL.
Details
Primary Language
English
Subjects
Other Fields of Education
Journal Section
Research Article
Publication Date
July 21, 2020
Submission Date
September 18, 2019
Acceptance Date
May 19, 2020
Published in Issue
Year 2020 Volume: 13 Number: 3