no code implementations • 14 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.
no code implementations • 8 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.
no code implementations • 28 Aug 2023 • Takuya Ishihara
This study considers the treatment choice problem when outcome variables are binary.
no code implementations • 6 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.
no code implementations • 31 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.
no code implementations • 15 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.
1 code implementation • 9 May 2022 • Koki Fusejima, Takuya Ishihara, Masayuki Sawada
Current diagnostic tests for regression discontinuity (RD) design face a multiple testing problem.
no code implementations • 14 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.
1 code implementation • 16 Sep 2020 • Takuya Ishihara, Masayuki Sawada
We present a new identification condition for regression discontinuity designs.
no code implementations • 13 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.