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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Mixed-data sampling ： ウィキペディア英語版 Mixed-data sampling Mixed-data sampling (MIDAS) is an econometric regression or filtering method developed by Ghysels ''et al.'' A simple regression example has the independent variable appearing at a higher frequency than the dependent variable: :$y\_t\; =\; \backslash beta\_0\; +\; \backslash beta\_1\; B(L^;\backslash theta)x\_t^\; +\; \backslash varepsilon\_t^,\backslash ,$ where ''y'' is the dependent variable, ''x'' is the regressor, ''m'' denotes the frequency – for instance if ''y'' is yearly $x\_t^$ is quarterly – $\backslash varepsilon$ is the disturbance and $B(L^;\backslash theta)$ is a lag distribution, for instance the Beta function or the Almon Lag. The regression models can be viewed in some cases as substitutes for the Kalman filter when applied in the context of mixed frequency data. Bai, Ghysels and Wright (2010) examine the relationship between MIDAS regressions and Kalman filter state space models applied to mixed frequency data. In general, the latter involve a system of equations, whereas in contrast MIDAS regressions involve a (reduced form) single equation. As a consequence, MIDAS regressions might be less efficient, but also less prone to specification errors. In cases where the MIDAS regression is only an approximation, the approximation errors tend to be small. ==See also== * Distributed lag * ARMAX 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mixed-data sampling」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.