Kyushu University Academic Staff Educational and Research Activities Database
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Kei Hirose Last modified date:2016.09.30

Graduate School
Undergraduate School
Other Organization

Academic Degree
Doctor of Functional Mathematics
Field of Specialization
Statistical Science, Machine Learning
Outline Activities
To analyze large-scale data such as gene expression data, we often need a statistical model which consists of a large number of parameters (e.g., hundreds of millions.) The sparse estimation, such as the lasso, makes most of the parameters exactly zero, enabling an efficient extraction of useful information from the data. Recently, I am interested in the development of new sparse estimation procedures in multivariate analysis, such as the factor analysis and the Gaussian graphical modeling. Specifically, I am developing several numerical algorithms that efficiently compute the estimate of the parameter, and also investigating theoretical properties of the estimated parameters. Most of the proposed methods are available for use in the R packages.
Research Interests
  • Development of sparse factor analysis
    keyword : Sparse estimation, factor anlaysis
Academic Activities
  • The following paper

    「Kei Hirose, Yukihiro Ogura and Hidetoshi Shimodaira. Estimating scale-free networks via the exponentiation of minimax concave penalty. Journal of the Japanese Society of Computational Statistics. 28 (1), pp.139-154, 2015」

    and several other papers related to sparse multivariate anlaysis.