My fields of specialization are theoretical and applied econometrics and statistics. My particular focuses in econometric research have been on nonparametric methods and time series econometrics since I earned a Ph.D. degree. Recently I have also paid attention to econometrics of data combination and proposed several estimation methods for regression models by combining two anonymous micro-datasets. Furthermore, I occasionally present research papers on nonparametric and semiparametric methods at statistical conferences and publish them in statistical journals.