bwght
coef_table()
Print coefficient estimates table
drop_test()
Wald test for the exclusion of regressors
earns
gpa1
het_test()
LM test for heteroskedasticity
hprice1
hseinv
intdef
rdchem
se()
Standard errors of coefficient estimates
traffic2
wageprc
white_test()
White's heteroskedasticity test