Search Results for author: Takuya Ishihara

Found 10 papers, 2 papers with code

Local-Polynomial Estimation for Multivariate Regression Discontinuity Designs

no code implementations14 Feb 2024 Masayuki Sawada, Takuya Ishihara, Daisuke Kurisu, Yasumasa Matsuda

We introduce a multivariate local-linear estimator for multivariate regression discontinuity designs in which treatment is assigned by crossing a boundary in the space of running variables.

regression valid

Adaptive Experimental Design for Policy Learning

no code implementations8 Jan 2024 Masahiro Kato, Kyohei Okumura, Takuya Ishihara, Toru Kitagawa

Setting the worst-case expected regret as the performance criterion of adaptive sampling and recommended policies, we derive its asymptotic lower bounds, and propose a strategy, Adaptive Sampling-Policy Learning strategy (PLAS), whose leading factor of the regret upper bound aligns with the lower bound as the size of experimental units increases.

counterfactual Experimental Design

Bandwidth Selection for Treatment Choice with Binary Outcomes

no code implementations28 Aug 2023 Takuya Ishihara

This study considers the treatment choice problem when outcome variables are binary.

regression

Asymptotically Optimal Fixed-Budget Best Arm Identification with Variance-Dependent Bounds

no code implementations6 Feb 2023 Masahiro Kato, Masaaki Imaizumi, Takuya Ishihara, Toru Kitagawa

We evaluate the decision based on the expected simple regret, which is the difference between the expected outcomes of the best arm and the recommended arm.

Shrinkage Methods for Treatment Choice

no code implementations31 Oct 2022 Takuya Ishihara, Daisuke Kurisu

Then, we compare the maximum regret of the proposed shrinkage rule with that of CES and pooling rules when the parameter space is correctly specified and misspecified.

Best Arm Identification with Contextual Information under a Small Gap

no code implementations15 Sep 2022 Masahiro Kato, Masaaki Imaizumi, Takuya Ishihara, Toru Kitagawa

We then develop the ``Random Sampling (RS)-Augmented Inverse Probability weighting (AIPW) strategy,'' which is asymptotically optimal in the sense that the probability of misidentification under the strategy matches the lower bound when the budget goes to infinity in the small-gap regime.

Joint diagnostic test of regression discontinuity designs: multiple testing problem

1 code implementation9 May 2022 Koki Fusejima, Takuya Ishihara, Masayuki Sawada

Current diagnostic tests for regression discontinuity (RD) design face a multiple testing problem.

regression

Evidence Aggregation for Treatment Choice

no code implementations14 Aug 2021 Takuya Ishihara, Toru Kitagawa

Consider a planner who has to decide whether or not to introduce a new policy to a certain local population.

Epidemiology

Manipulation-Robust Regression Discontinuity Designs

1 code implementation16 Sep 2020 Takuya Ishihara, Masayuki Sawada

We present a new identification condition for regression discontinuity designs.

regression

Efficient Adaptive Experimental Design for Average Treatment Effect Estimation

no code implementations13 Feb 2020 Masahiro Kato, Takuya Ishihara, Junya Honda, Yusuke Narita

In adaptive experimental design, the experimenter is allowed to change the probability of assigning a treatment using past observations for estimating the ATE efficiently.

Experimental Design

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