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. 2022 Jul 21;17(7):e0271542.
doi: 10.1371/journal.pone.0271542. eCollection 2022.

Estimation in regret-regression using quadratic inference functions with ridge estimator

Nur Raihan Abdul Jalil  1 , Nur Anisah Mohamed  1 , Rossita Mohamad Yunus  1
Affiliations

Estimation in regret-regression using quadratic inference functions with ridge estimator

Nur Raihan Abdul Jalil et al. PLoS One. .

Abstract

In this paper, we propose a new estimation method in estimating optimal dynamic treatment regimes. The quadratic inference functions in myopic regret-regression (QIF-MRr) can be used to estimate the parameters of the mean response at each visit, conditional on previous states and actions. Singularity issues may arise during computation when estimating the parameters in ODTR using QIF-MRr due to multicollinearity. Hence, the ridge penalty was introduced in rQIF-MRr to tackle the issues. A simulation study and an application to anticoagulation dataset were conducted to investigate the model's performance in parameter estimation. The results show that estimations using rQIF-MRr are more efficient than the QIF-MRr.

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Conflict of interest statement

The authors have declared that no competing interests exist.

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