OLS estimate of beta and usual standard errors 
 
51.144 32.41 0.878 1.379 14.01 13.605 
1.621 1.409 0.062 0.278 1.068 1.621 
 
 
GLS estimate of beta and usual standard errors 
 
50.479 32.114 0.905 1.386 13.572 13.752 
1.47 1.933 0.024 0.352 0.818 1.955 
 
 
Robust sandwich standard errors 
 
1.988 1.33 0.023 0.109 0.992 0.747