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Anytown assumed assumption autocorrelation beta coefficient Chapter compute constant term correlation curve D-W statistic degrees of freedom demand and supply dependent derived dummy variable econometric methods econometric model economic equa equation 5-4 error term estimated coefficients estimated model extrapolate female students Figure l3-2 Figure l4-l FORMATC formula frS'T function grade determining model heteroscedasticity impact increase independent variables indicated least squares estimators linear logarithms mean Mobile model model forecasts monthly multicollinearity multiple regression multiple regression model normal distribution null hypothesis observations obtain parameters partial R2 percent personal income Phillips Curve population poverty line predetermined variables reduced form equations regression analysis regression model residuals sample sector sex status simulation simultaneous equation model sources SS'T stage estimation standard deviation standard error statistically significant structural equations study hours supply schedule Table l3-l test scores tion TSLS unexplained variance variance variation zero