Volume 6, Issue 6 (June 2019), Pages: 22-29
Original Research Paper
Title: Validation of a developed university placement test using classical test theory and Rasch measurement approach
Author(s): Ado Abdu Bichi *, Rohaya Talib, Noor Azean Atan, Halijah Ibrahim, Sanitah Mohd Yusof
School of Education, Universiti Teknologi Malaysia 81310, Jahor Bahru, Malaysia
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* Corresponding Author.
Corresponding author's ORCID profile: https://orcid.org/0000-0003-2897-5136
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University entrances examinations are conducted to ensure qualified applicant are placed into appropriate programs of their choices. The outcomes of the test have an important and significant value in taking appropriate decision on the applicant’s eligibility, the validity of that examination is paramount to achieving the set goal. The aim of this study is to provide empirical evidence of the construct validity of the newly developed Economics Test using traditional Classical Test Theory and Rasch Measurement Model. The developed Economics Test consists of 70 items after expert judgment and review was administered to 280 students, age 16-20 randomly selected from two public schools in Kano. The study employed a CTT and Rasch model to analyze the data using ITEMAN 4.3 and WINSTEPS 3.72.3 software. The softwares automatically generate the recommended estimate of the parameters to judge the quality of the test items. The results of CTT identified 17 problematic items using difficulty and discriminating index. The results of Rasch showed person statistics (Separation 2.40>2.00 and reliability 0.85>0.80) and item statistics (separation 3.73>3.0 and reliability 0.93>0.8) an excellent person and item reliability. The test measures unidimensional construct supported by the raw variance of 24.9% explained by measures. Investigation of the item person map revealed that the test covered a wide range of the examinees’ ability. Overall, using Rasch 10 misfitting construct irrelevant items were identified for deletion. While CTT provides information that is limited to two parameters, the Rasch results provide very detailed information on the quality of the test items. Thus both models can be integrated to generate enough evidence of validity and reliability items in the development of a standardize test.
© 2019 The Authors. Published by IASE.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords: Rash model, Classical test theory, Validity, Placement test, Item response theory
Article History: Received 15 December 2018, Received in revised form 29 March 2019, Accepted 1 April 2019
Compliance with ethical standards
Conflict of interest: The authors declare that they have no conflict of interest.
Bichi AA, Talib R, and Atan NA et al. (2019). Validation of a developed university placement test using classical test theory and Rasch measurement approach. International Journal of Advanced and Applied Sciences, 6(6): 22-29
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