This is what I am trying to do test the null hypothesis that geographic regions jointly do not matter for earnings.
Here is my unrestricted regression
ftest1 <- lmrob(log(df$wage)~ df$educ + df$northeast + df$midwest + df$south)
This is the code that is not giving me the f stest
linearHypothesis(ftest1, c("df$northeast + df$midwest + df$south = 0"))
I was expecting the f test but instead got the chisquared test