Search Results for author: Kosuke Imai

Found 20 papers, 3 papers with code

Does AI help humans make better decisions? A methodological framework for experimental evaluation

no code implementations18 Mar 2024 Eli Ben-Michael, D. James Greiner, Melody Huang, Kosuke Imai, Zhichao Jiang, Sooahn Shin

We consider a single-blinded experimental design, in which the provision of AI-generated recommendations is randomized across cases with a human making final decisions.

Decision Making Experimental Design

The Cram Method for Efficient Simultaneous Learning and Evaluation

no code implementations11 Mar 2024 Zeyang Jia, Kosuke Imai, Michael Lingzhi Li

Our extensive simulation studies show that, when compared to sample-splitting, cramming reduces the evaluation standard error by more than 40% while improving the performance of learned policy.

Individualized Policy Evaluation and Learning under Clustered Network Interference

no code implementations4 Nov 2023 Yi Zhang, Kosuke Imai

Under this model, we propose an estimator that can be used to evaluate the empirical performance of an ITR.

Statistical Performance Guarantee for Subgroup Identification with Generic Machine Learning

no code implementations12 Oct 2023 Michael Lingzhi Li, Kosuke Imai

Across a wide array of disciplines, many researchers use machine learning (ML) algorithms to identify a subgroup of individuals who are likely to benefit from a treatment the most (``exceptional responders'') or those who are harmed by it.

Bayesian Safe Policy Learning with Chance Constrained Optimization: Application to Military Security Assessment during the Vietnam War

no code implementations17 Jul 2023 Zeyang Jia, Eli Ben-Michael, Kosuke Imai

First, before implementing a new algorithm, it is essential to characterize and control the risk of yielding worse outcomes than the existing algorithm.

Decision Making

Distributionally Robust Causal Inference with Observational Data

no code implementations15 Oct 2022 Dimitris Bertsimas, Kosuke Imai, Michael Lingzhi Li

We consider the estimation of average treatment effects in observational studies and propose a new framework of robust causal inference with unobserved confounders.

Causal Inference

Race and ethnicity data for first, middle, and last names

no code implementations26 Aug 2022 Evan T. R. Rosenman, Santiago Olivella, Kosuke Imai

Counts can then be normalized row-wise or column-wise to obtain conditional probabilities of race given name or name given race.

Imputation

Policy Learning with Asymmetric Counterfactual Utilities

no code implementations21 Jun 2022 Eli Ben-Michael, Kosuke Imai, Zhichao Jiang

We consider optimal policy learning with asymmetric counterfactual utility functions of this form that consider the joint set of potential outcomes.

counterfactual Decision Making

Addressing Census data problems in race imputation via fully Bayesian Improved Surname Geocoding and name supplements

no code implementations12 May 2022 Kosuke Imai, Santiago Olivella, Evan T. R. Rosenman

To address the missing surname problem, we supplement the Census surname data with additional data on last, first, and middle names taken from the voter files of six Southern states where self-reported race is available.

Bayesian Inference Imputation

Statistical Inference for Heterogeneous Treatment Effects Discovered by Generic Machine Learning in Randomized Experiments

no code implementations28 Mar 2022 Kosuke Imai, Michael Lingzhi Li

In addition, we develop nonparametric tests of treatment effect homogeneity across groups, and rank-consistency of within-group average treatment effects.

valid

Using Machine Learning to Test Causal Hypotheses in Conjoint Analysis

1 code implementation20 Jan 2022 Dae Woong Ham, Kosuke Imai, Lucas Janson

We propose a new hypothesis testing approach based on the conditional randomization test to answer the most fundamental question of conjoint analysis: Does a factor of interest matter in any way given the other factors?

BIG-bench Machine Learning Decision Making +1

Safe Policy Learning through Extrapolation: Application to Pre-trial Risk Assessment

no code implementations22 Sep 2021 Eli Ben-Michael, D. James Greiner, Kosuke Imai, Zhichao Jiang

We extend this approach to common and important settings where humans make decisions with the aid of algorithmic recommendations.

Decision Making

Estimating Average Treatment Effects with Support Vector Machines

no code implementations23 Feb 2021 Alexander Tarr, Kosuke Imai

Support vector machine (SVM) is one of the most popular classification algorithms in the machine learning literature.

Sequential Monte Carlo for Sampling Balanced and Compact Redistricting Plans

2 code implementations13 Aug 2020 Cory McCartan, Kosuke Imai

Because it draws many plans in parallel, the SMC algorithm can efficiently explore the relevant space of redistricting plans better than the existing Markov chain Monte Carlo (MCMC) algorithms that generate plans sequentially.

Applications Computers and Society Probability

Principal Fairness for Human and Algorithmic Decision-Making

no code implementations21 May 2020 Kosuke Imai, Zhichao Jiang

Using the concept of principal stratification from the causal inference literature, we introduce a new notion of fairness, called principal fairness, for human and algorithmic decision-making.

Causal Inference counterfactual +2

Keyword Assisted Topic Models

1 code implementation13 Apr 2020 Shusei Eshima, Kosuke Imai, Tomoya Sasaki

An important advantage of the proposed keyword assisted topic model (keyATM) is that the specification of keywords requires researchers to label topics prior to fitting a model to the data.

Document Classification Topic Models

Large-scale text processing pipeline with Apache Spark

no code implementations2 Dec 2019 Alexey Svyatkovskiy, Kosuke Imai, Mary Kroeger, Yuki Shiraito

In this paper, we evaluate Apache Spark for a data-intensive machine learning problem.

Experimental Evaluation of Individualized Treatment Rules

no code implementations14 May 2019 Kosuke Imai, Michael Lingzhi Li

We extend our methodology to a common setting, in which the same experimental data is used to both estimate and evaluate ITRs.

Robust Estimation of Causal Effects via High-Dimensional Covariate Balancing Propensity Score

no code implementations20 Dec 2018 Yang Ning, Sida Peng, Kosuke Imai

We first use a class of penalized M-estimators for the propensity score and outcome models.

valid

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