Hi everyone!
I'm new to R, and I've sent this message as a non-member, but since it's
pretty urgent, I'm sending it again now I'm on the mailing list (Thanks
Daniel for your suggestion nevertheless).

I have calculated a regression in the form of M ~ D + O + S, and I would
like to take this regression and test it with other samples, 5 sets of M, D,
O, and S at a time(I actually have 2000 sets, so it's probably not efficient
to make each a separate set and then index). Since I'll need to test the
regression for 400 groups, I thought a for loop might be necessary. I've put
everything into a data frame already. Can anyone tell me how to write the
code? I'm especially not sure about how to do the for loop.
And then how would I calculate the error of how well the test samples fit
the original regression?
This is for my internship, so it's very urgent.
THANKS A LOT!!!!!
RBeginner

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