Econometrics Econometrics-- Economics econometrics Economics Regression analysis Autocorrelation CLASSICAL MODEL Data Economics-basic Mathematical economics Matrix Nature of regressing analysis Production (Economic theory)--Econometric models SIMULTANEOUS-EQUATION MODELS SINGLE-EQUATION REGRESSION MODEL Statistical methods TOPICS economics-regression analysis single-equation regression models, multiple regressin analysis, Dummy variable Regression models, Autocorrelation the Problem of Estimation