Search Results for author: Ashkan Ertefaie

Found 9 papers, 5 papers with code

Nonparametric estimation of a covariate-adjusted counterfactual treatment regimen response curve

no code implementations28 Sep 2023 Ashkan Ertefaie, Luke Duttweiler, Brent A. Johnson, Mark J. Van Der Laan

Third, we provide consistency and convergence rate for the optimizer of the regimen-response curve estimator; this enables us to estimate an optimal semiparametric rule.

counterfactual

Causal inference for the expected number of recurrent events in the presence of a terminal event

no code implementations28 Jun 2023 Benjamin R. Baer, Robert L. Strawderman, Ashkan Ertefaie

We study causal inference and efficient estimation for the expected number of recurrent events in the presence of a terminal event.

Causal Inference

Inference for relative sparsity

1 code implementation25 Jun 2023 Samuel J. Weisenthal, Sally W. Thurston, Ashkan Ertefaie

Further, in the relative sparsity work, the authors only considered the single-stage decision case; here, we consider the more general, multi-stage case.

Relative Sparsity for Medical Decision Problems

1 code implementation29 Nov 2022 Samuel J. Weisenthal, Sally W. Thurston, Ashkan Ertefaie

This end is facilitated if one can pinpoint the aspects of the policy (i. e., the parameters for blood pressure and heart rate) that change when moving from the standard of care to the new, suggested policy.

Instrumented Difference-in-Differences

1 code implementation6 Nov 2020 Ting Ye, Ashkan Ertefaie, James Flory, Sean Hennessy, Dylan S. Small

Unmeasured confounding is a key threat to reliable causal inference based on observational studies.

Causal Inference Methodology

Nonparametric inverse probability weighted estimators based on the highly adaptive lasso

2 code implementations22 May 2020 Ashkan Ertefaie, Nima S. Hejazi, Mark J. Van Der Laan

We propose a class of nonparametric inverse probability weighted estimators in which the weighting mechanism is estimated via undersmoothing of the highly adaptive lasso, a nonparametric regression function proven to converge at $n^{-1/3}$-rate to the true weighting mechanism.

Robust Q-learning

no code implementations27 Mar 2020 Ashkan Ertefaie, James R. McKay, David Oslin, Robert L. Strawderman

Q-learning is a regression-based approach that is widely used to formalize the development of an optimal dynamic treatment strategy.

Q-Learning regression

Outcome-adaptive lasso: variable selection for causal inference

1 code implementation Biometrics 2017 Susan M Shortreed, Ashkan Ertefaie

Traditionally, a “throw in the kitchen sink” approach has been used to select covariates for inclusion into the propensity score, but recent work shows including unnecessary covariates can impact both the bias and statistical efficiency of propensity score estimators.

Causal Inference Variable Selection

Constructing Dynamic Treatment Regimes in Infinite-Horizon Settings

no code implementations3 Jun 2014 Ashkan Ertefaie

The application of existing methods for constructing optimal dynamic treatment regimes is limited to cases where investigators are interested in optimizing a utility function over a fixed period of time (finite horizon).

Nutrition

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