econ483practicemidterm

econ483practicemidterm - Econ 483. Applied Econometric...

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Econ 483. Applied Econometric Modeling Practice Questions for Midterm to 2 books. You are NOT allowed to use your own computer. 1. Review all the questions in quiz 1 and computer lab practice 1-3. 2. Suppose X 1 ; X 2 ; :::; X 1000 are iid N (0 ; 1) variables. (1) Calculate E [ X 20 ] . (2) Let ( x 1 ; x 2 ; :::; x 1000 ) be a realization of the random variables ( X 1 ; X 2 ; :::; X 1000 ) . These realized values are stored in XXX.dta. Using STATA, calculate and report the sample mean of the ±rst 10 observations, ( x 1 ; x 2 ; :::; x 10 ) . (3) Report the sample mean of the ±rst 100 observations, ( x 1 ; x 2 ; :::; x 100 ) and the sample mean of the whole sample ( x 1 ; x 2 ; :::; x 1000 ) . (4) In general, 1 n P n i =1 x i is not exactly zero. Do you expect that 1 n P n i =1 x i will converge to a non- random number? Why? 3 Consider a regression model: y i = & 0 + 1 x i + u i , i = 1 ; 2 ; :::; n , where & 0 and 1 are the parameters of our interest. (1) Is this model a linear model? Explain brie²y.
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This note was uploaded on 06/05/2008 for the course ECON 483 taught by Professor Seikkim during the Spring '08 term at University of Washington.

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econ483practicemidterm - Econ 483. Applied Econometric...

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