1. Data input
STATA format
EXCEL format
Other format

2. STATA format

6. Excel format

14. Other format

19. Graph
Scatter
Linear prediction

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

38. Linear regression

42. Linear regression with robust standard errors

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

46. Linear regression with multicollinearlity

49. Linear regression with high collinearlity

54. Hypothesis Testing

59. 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