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Practical 3 - • Assumption 2 X values fixed in repeated...

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Practical 3 January 20, 2010
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More on OLS on GRETL • Generating random variables • Run a regression! • There is a possibility of a  Type-I error.
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Verifying the OLS  assumptions • Use Stock & Watson [CASCHOOL] • From <CONSOLE> ; ols testscr const  str • testscr _hat  = 698.933       2.27981 str (9.4675)       (0.47983) • Note R-squared = RSS/TSS = 0.05124 • Hypothesis testing (2-sided test): H 0 β 1  = 0 vs. H a β 1    0 H 0 β 2  = 0 vs. H a β 2    0 • Note: t-stat =  β _hat /SE( β _hat )
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• Assumption 1: Linear Regression Model
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Unformatted text preview: • Assumption 2: X values fixed in repeated sampling • Assumption 3: Zero mean value of disturbance • Assumption 4: Homoskedasticity (constant variance) • Assumption 5: No autocorrelation between disturbances • Assumption 6: Zero covariance between u and X So are we happy with the regression? • No! There could be a possibility of omitted variable bias! • Chk corr(el_pct,str) and corr(el_pct,testscr). The F-test • F-stat...
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