Hi all, I'm new to R and I'm trying to learn it to use with my undergraduate econometrics courses. I'm trying to work through Justin Shea's examples for Wooldridge's book, and I've hit a snag. This has to be easy, but I can't figure it out.
Using this code:
I've entered two mean functions here to show what I've tried...both give the same erro.
I get results from the regression, but when I try to find the mean, or use lprice in other functions, I get an "object 'lprice' not found" error.
Obviously lprice is there as it worked in the linear model, so, there's clearly something I'm missing, but I can't find it.
Any help is appreciated...thanks.