Search Results for author: Nima S. Hejazi

Found 7 papers, 5 papers with code

A framework for causal segmentation analysis with machine learning in large-scale digital experiments

1 code implementation1 Nov 2021 Nima S. Hejazi, Wenjing Zheng, Sathya Anand

We present an end-to-end methodological framework for causal segment discovery that aims to uncover differential impacts of treatments across subgroups of users in large-scale digital experiments.

Causal Inference

Targeting Learning: Robust Statistics for Reproducible Research

no code implementations12 Jun 2020 Jeremy R. Coyle, Nima S. Hejazi, Ivana Malenica, Rachael V. Phillips, Benjamin F. Arnold, Andrew Mertens, Jade Benjamin-Chung, Weixin Cai, Sonali Dayal, John M. Colford Jr., Alan E. Hubbard, Mark J. Van Der Laan

Targeted Learning is a subfield of statistics that unifies advances in causal inference, machine learning and statistical theory to help answer scientifically impactful questions with statistical confidence.

Causal Inference Survival Analysis

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.

Efficient nonparametric inference on the effects of stochastic interventions under two-phase sampling, with applications to vaccine efficacy trials

3 code implementations30 Mar 2020 Nima S. Hejazi, Mark J. Van Der Laan, Holly E. Janes, Peter B. Gilbert, David C. Benkeser

We propose nonparametric methodology for efficiently estimating a counterfactual parameter that quantifies the impact of a given immune response marker on the subsequent probability of infection.

Methodology

A generalization of moderated statistics to data adaptive semiparametric estimation in high-dimensional biology

1 code implementation16 Oct 2017 Nima S. Hejazi, Sara Kherad-Pajouh, Mark J. Van Der Laan, Alan E. Hubbard

The widespread availability of high-dimensional biological data has made the simultaneous screening of many biological characteristics a central problem in computational biology and allied sciences.

Methodology

Data-adaptive statistics for multiple hypothesis testing in high-dimensional settings

1 code implementation24 Apr 2017 Weixin Cai, Nima S. Hejazi, Alan E. Hubbard

Current statistical inference problems in areas like astronomy, genomics, and marketing routinely involve the simultaneous testing of thousands -- even millions -- of null hypotheses.

Astronomy Marketing +3

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