Hi everyone,

I'm sure this is pretty basic but I couldn't find a clear example of how to
do this. I'm running a regression, say:
reg <- lm(Y ~ x1 + year) 
where x1 is a continuous variable and year is a factor with various year
levels. Individually,  each year factor variable is not significant, but I
have a suspicion they are jointly significant. I can't figure out how to run
a linearHypothesis test with a factor, i.e.
linearHypothesis(reg, ??? year=0 ??? , vcov=vcovHC(reg, , "HC1"))

Would be very much appreciated.

Many thanks,

Alex

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