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Added variable plot in nonlinear regression
Journal of the Korean Data & Information Science Society 2021;32:705-14
Published online July 31, 2021;
© 2021 Korean Data and Information Science Society.

Myung-Wook Kahng 1

1Department of Statistics, Sookmyung Women’s University
Correspondence to: 1 Professor, Department of Statistics, SookmyungWomen’s University, Cheongpa-ro 47-gil 100, Yongsangu, Seoul 04310, Korea. E-mail:
Received June 17, 2021; Revised July 9, 2021; Accepted July 20, 2021.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Graphical methods for displaying relevant information in linear regression analysis are widely used for regression diagnosis. The added variable plot plays an important role in examining the marginal effects of the explanatory variable along with the hypothesis test. In this paper, we extend the added variable plots to nonlinear regression. These plots are significantly related to score tests, and we also examine the relationship between score tests and added variable plots in nonlinear regression. We apply the added variable plots and score tests to the actual data.
Keywords : Added variable plot, information matrix, score test, score vector, Wald test.