翻訳と辞書 Words near each other ・ Synthetic Aperture Personality Assessment ・ Synthetic aperture radar ・ Synthetic aperture sonar ・ Synthetic Aperture Ultrasound ・ Synthetic biodegradable polymer ・ Synthetic biological circuit ・ Synthetic biology ・ Synthetic bond ・ Synthetic Breed ・ Synthetic cannabinoid ・ Synthetic cannabis ・ Synthetic catalytic scavenger ・ Synthetic CDO ・ Synthetic chord ・ Synthetic Communications ・ Synthetic control method ・ Synthetic crude ・ Synthetic currency pair ・ Synthetic data ・ Synthetic diamond ・ Synthetic differential geometry ・ Synthetic Dimensions ・ Synthetic division ・ Synthetic Division (album) ・ Synthetic dreads ・ Synthetic ecosystems ・ Synthetic element ・ Synthetic Entertainment ・ Synthetic environment ・ Synthetic Environment for Analysis and Simulations Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Synthetic control method ： ウィキペディア英語版 Synthetic control method Abadie et al. (2010) motivate the synthetic control method with a model that generalizes the difference-in-differences (fixed-effects) model commonly applied in the empirical social science literature by allowing the effect of unobserved confounding characteristics to vary over time. An attractive feature of the synthetic control method is that it guards against extrapolation outside the convex hull of the data because weights from all control units can be chosen to be positive and sum to one. ==Synthetic Control Method models〔\Synthetic Control Methods for Comparative Case Studies: Estimating the Effect of California's Tobacco Control Program."Journal of the American Statistical Association, 105(490), 493=1. Each W represents one particular weighted average of control units and therefore one potential synthetic control unit. The goal is to optimize the W * such that the resulting synthetic control unit best approximates the unit exposed to the intervention with respect to the outcome predictors $U\_i$ and $M$ linear combinations of pre-intervention outcomes $\backslash bar^,...,\backslash bar^$ where $W^$ *=w_2^ *+...+w_^ * such that: $\backslash sum\_^\; w\_j^$ *\bar^ = \bar^,, ..., $\backslash sum\_^\; w\_j^$ *\bar^ = \bar^, and $\backslash sum\_^\; w\_j^$ *U_j = U_1 hold. Then : $\backslash hat\backslash alpha\_=\; Y\_1t\; -\; \backslash sum\_^\; w\_j^$ *Y_ yields an estimator of $\backslash alpha\_$ in periods $T\_0+1,T\_0+2,...,T$ The W * was solved by minimize: $\backslash left\backslash |\; \backslash mathbf\; \backslash right\backslash |\_V\; =\; \backslash sqrt$, where 'V' is defined as (k×k) symmetric and positive semidefinite matrix. V * is chosen among all positive definite and diagnal matrices such that the mean square prediction error(MSPE) of the outcome variable is minimized over pre-intervention period. 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「Synthetic control method」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.