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The effect of private tutoring for Daegu students according to the method of propensity score
Journal of the Korean Data & Information Science Society 2019;30:745-57
Published online July 31, 2019;  https://doi.org/10.7465/jkdi.2019.30.4.745
© 2019 Korean Data and Information Science Society.

Soorack Ryu1 · Jinseub Hwang2

1Department of Statistics, Daegu University
2Division of Mathematics and Big Data Science, Daegu University
Correspondence to: Assistant professor, Division of Mathematics and Big Data Science, Daegu University, Gyeongbuk 38453, Korea. E-mail: hjs0409@daegu.ac.kr

This research was supported by the Research Grant 2017 of Daegu Educational Research and Information Institute.
Received June 5, 2019; Revised July 8, 2019; Accepted July 11, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
In this study we use the 2016 educational survey data of Daegu Educational Research and Information Institute and we confirm the effect of private tutoring for elementary, middle and high school students in Daegu about the academic achievement, learning understanding and national mock test based on propensity score (matching, covariate adjusting and IPTW (inverse probability of treatment weighting)). According to the results, in elementary school, there are significant effects for the academic achievement and learning understanding of Math when using IPTW. In middle school, it is an effective for the learning understanding of Math and English when using matching, and in all except for the learning understanding of Korean based on IPTW. In high school, all except the academic achievement of English have significant effect when using matching and there are significant effects for the academic achievement and national mock test in Korean and Math, and the academic achievement in Math based on IPTW and covariate adjusting, respectively. The effectiveness of a private tutoring by grade and subject is different according to the method, so it is necessary to select the propensity score method appropriate for the research purpose considering the characteristics of methods.
Keywords : Confounding factors, Daegu educational survey, private tutoring, propensity score.