阿摩線上測驗 登入

最新科目

最新試卷

115年 - 危險物品運送人員訓練:罐槽車_選擇題 1-50(2026/06/01 更新)#144742(50題)

115年 - 115 臺北自來水事業處及所屬工程總隊_新進職員(工)甄試試題_職員—助理管理師【資訊處理(硬體)】_資訊處理(二) :1. 電腦網路 2. 資通安全#144741(50題)

115年 - 115 臺北自來水事業處及所屬工程總隊_新進職員(工)甄試試題_職員—助理管理師【企業管理】:自來水營業管理#144740(50題)

115年 - 115 臺北自來水事業處及所屬工程總隊_新進職員(工)甄試試題_職員—助理工程師【機電工程】:電工原理#144713(50題)

115年 - 115 臺北自來水事業處及所屬工程總隊_新進職員(工)甄試試題_職員—四級工程師:土木工程#144705(40題)

115年 - 115 臺北自來水事業處及所屬工程總隊_新進職員(工)甄試試題_職員—四級工程師/助理工程師/助理管理師_共同科目:英文#144704(15題)

115年 - 115 臺北自來水事業處及所屬工程總隊_新進職員(工)甄試試題_職員—助理工程師【機電工程】:基本電學#144703(50題)

115年 - 115 國立台北教育大學師資培育處_各類料教育學程暨小學雙語模組甄選複審試題:國語文#144702(35題)

115年 - 115 國立台北教育大學師資培育處_各類料教育學程暨小學雙語模組甄選複審試題:教育心理學#144701(2題)

115年 - 115 臺北自來水事業處及所屬工程總隊_新進職員(工)甄試試題_職員—四級工程師/助理工程師/助理管理師_共同科目:自來水法規#144700(15題)

最新試題

10. Consider the wage equation $\ln(wagei) = \beta0 + \beta1 educi + ui$, where ui contains unobserved ability abilityi and local labor-market quality Li. Assume Cov(educi, abilityi) > 0and Li directly affects wages. A proposed instrument is distance to nearest college, zi. Suppose zi is strongly correlated with Li (e.g. urban areas have smaller distance and higher wages even holding education fixed), and $L_i$ is omitted from the regression. Which statement is most correct?(A) The exclusion restriction may fail because \( z{i} \) can affect \( \ln (wage{i}) \) through \( L{i} \), so \( Cov(z{i},u_{i}) \) may be nonzero.(B) If is always consistent regardless of \( L_i \)(C) Adding an intercept is sufficient to control for \( L_{i} \)(D) If OLS is biased, IV must be unbiased in finite samples

9. Suppose you estimate a log-level model $\ln(yi) = \beta0 + \beta1 xi + ui, \quad yi > 0,$with $E(ui \mid xi) = 0$. Using the standard approximation for small changes, which interpretation of $\beta_1$ is correct?(A) A one-unit increase in \( x \) changes \( y \) by exactly \( \beta_{1} \) units(B) A one-percent increase in \( x \) changes \( y \) by approximately \( \beta_{1} \) percent(C) A one-unit increase in \( x \) changes \( E(y \mid x) \) by approximately \( 100\beta_{1} \) percent(D) \( \beta_{1} \) is the price elasticity of demand

8. Let a categorical variable $Gi \in \{1,2,3,4\}$ and define dummies $D{ki} = \mathbf{1}\{Gi = k\}$, $k = 1,2,3,4$. Consider the regression with an intercept: $yi = \beta0 + \beta1 D{1i} + \beta2 D{2i} + \beta3 D{3i} + \beta4 D{4i} + ui$. Which statement is correct?(A) The model is identified because the dummies are mutually exclusive(B) The model is not identified because \( \sum{k=1}^{4} D{ki} = 1 \) for all \( i \); drop one dummy or drop the intercept(C) The model is identified if \( n \) is large enough(D) Identification fails only if one group has zero observations試題隨卷繳交接背面4國立臺北大學 115 學年度碩士班一般入學考試試題系(所)組別:經濟學系科 目:統計學第4頁 共4頁☑可 ☐不可使用計算機

最新申論題

最新課程

最新主題筆記

最新討論