no code implementations • 6 Feb 2024 • Chiaki Moriguchi, Yusuke Narita, Mari Tanaka
What happens if selective colleges change their admission policies?
1 code implementation • 26 Jun 2023 • Haruka Kiyohara, Masatoshi Uehara, Yusuke Narita, Nobuyuki Shimizu, Yasuo Yamamoto, Yuta Saito
We show that the resulting estimator, which we call Adaptive IPS (AIPS), can be unbiased under any complex user behavior.
no code implementations • 4 Dec 2022 • Yusuke Narita, Kyohei Okumura, Akihiro Shimizu, Kohei Yata
Off-policy evaluation (OPE) attempts to predict the performance of counterfactual policies using log data from a different policy.
1 code implementation • 25 Nov 2022 • Takuma Udagawa, Haruka Kiyohara, Yusuke Narita, Yuta Saito, Kei Tateno
Although many estimators have been developed, there is no single estimator that dominates the others, because the estimators' accuracy can vary greatly depending on a given OPE task such as the evaluation policy, number of actions, and noise level.
no code implementations • 4 May 2022 • Haoge Chang, Yusuke Narita, Kota Saito
We obtain a necessary and sufficient condition under which random-coefficient discrete choice models, such as mixed-logit models, are rich enough to approximate any nonparametric random utility models arbitrarily well across choice sets.
2 code implementations • 3 Feb 2022 • Haruka Kiyohara, Yuta Saito, Tatsuya Matsuhiro, Yusuke Narita, Nobuyuki Shimizu, Yasuo Yamamoto
We show that the proposed estimator is unbiased in more cases compared to existing estimators that make stronger assumptions.
2 code implementations • 31 Aug 2021 • Yuta Saito, Takuma Udagawa, Haruka Kiyohara, Kazuki Mogi, Yusuke Narita, Kei Tateno
Unfortunately, identifying a reliable estimator from results reported in research papers is often difficult because the current experimental procedure evaluates and compares the estimators' performance on a narrow set of hyperparameters and evaluation policies.
2 code implementations • 26 Apr 2021 • Yusuke Narita, Kohei Yata
Algorithms make a growing portion of policy and business decisions.
no code implementations • 15 Apr 2021 • Yusuke Narita, Ayumi Sudo
Democracy is widely believed to contribute to economic growth and public health in the 20th and earlier centuries.
no code implementations • 31 Dec 2020 • Atila Abdulkadiroglu, Joshua D. Angrist, Yusuke Narita, Parag Pathak
The New York City public high school match illustrates the latter, using test scores and other criteria to rank applicants at ``screened'' schools, combined with lottery tie-breaking at unscreened ``lottery'' schools.
3 code implementations • 17 Aug 2020 • Yuta Saito, Shunsuke Aihara, Megumi Matsutani, Yusuke Narita
Our dataset is unique in that it contains a set of multiple logged bandit datasets collected by running different policies on the same platform.
no code implementations • 20 Feb 2020 • Yusuke Narita, Shota Yasui, Kohei Yata
Efficient methods to evaluate new algorithms are critical for improving interactive bandit and reinforcement learning systems such as recommendation systems.
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.
no code implementations • 10 Sep 2018 • Yusuke Narita, Shota Yasui, Kohei Yata
What is the most statistically efficient way to do off-policy evaluation and optimization with batch data from bandit feedback?
Ranked #1 on Visual Object Tracking on VOT2014