Research field (1)：
Applied mathematics and statistics
Research theme for competitive and other funds (9)：
2022 - 2026 A Study of Cognitive Processes in Investor Decision Making Using Eye Tracking
2018 - 2023 EMアルゴリズムに代わる欠測データを用いたパラメータ推定法の開発
2016 - 2021 パスデータの融合による研究フロンティアの創出
2016 - 2018 How serious is nonignorable missingness?
2014 - 2018 Study on the creation of a new ignobility condition and the investigation of an estimator distribution in the analysis of missing data
2013 - 2016 New developments of missing data analysis: NMARness and APB
2010 - 2015 Experiment and Modeling of Consumer Behavior Analysis by Using Shopping Path Data
2012 - 2014 Development of Analysis Methods based on Generalized Methods of Moments for Nonignorable Missing Data
2010 - 2014 Statistical prediction, causation, incomplete data analysis and foundation of sciencee
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Papers (20)：
Keiji Takai, Kenichi Hayashi. Model Selection with Missing Data Embedded in Missing-at-Random Data. Stats. 2023. 6. 2. 495-505
Keiji Takai. Incomplete-data Fisher scoring method with steplength adjustment. Statistics and Computing. 2020. 30. 4. 871-886
Katsutoshi Yada, Kei Miyazaki, Keiji Takai, Kohei Ichikawa. A Framework of ASP for Shopping Path Analysis. Proceedings - 2017 4th Asia-Pacific World Congress on Computer Science and Engineering, APWC on CSE 2017. 2018. 49-54
TAKAI,Keiji. On the use of the selection matrix in the maximum like- lihood estimation of normal distribution models with missing data. Communications in Statistics - Theory and Methods. 2018. 47,14,3992-3407
Pierre-Yves Donze, Ken Ishibashi, Bo Wu, Yuta Kaneko, Kei Miyazaki, Keiji Takai. Global Distribution of Watches A network analysis of trade relations. 2017 17TH IEEE INTERNATIONAL CONFERENCE ON DATA MINING WORKSHOPS (ICDMW 2017). 2017. 605-611
