Data input STATA format EXCEL format Other format

STATA format

Excel format

Other format

Graph Scatter Linear prediction

Regression Linear regression (homoscedasticity) Linear regression with robust standard errors

Linear regression

Linear regression with robust standard errors

If you use the “, robust” option, the STATA computes heteroskedasticity-robust standard errors. Otherwise, STATA computes homoskedasticity-only standard errors.

Linear regression with multicollinearlity

Linear regression with high collinearlity

Hypothesis Testing

Multiple regression Regress testscr str ,robust Regress testscr str elpct ,robust Regress testscr str elpct meal_pct ,robust Regress testscr str elpct calw_pct ,robust Regress testscr str elpct meal_pct calw_pct ,robust