Hello and thank you both for your answers!
Dennis, I tried to simply run
lm(a ~ b)
after re-importing a as a matrix, but I get the following error message:
Error in model.frame.default(formula = a ~ b, drop.unused.levels = TRUE) :
invalid type (list) for variable 'a'
so maybe I have to
On Mar 31, 2010, at 9:13 AM, Driss Agramelal wrote:
Hello and thank you both for your answers!
Dennis, I tried to simply run
lm(a ~ b)
after re-importing a as a matrix, but I get the following error
message:
Error in model.frame.default(formula = a ~ b, drop.unused.levels =
TRUE)
Driss,
David is right - you should include data/code.
Nevertheless, the error you get suggests that what you
call a matrix is in fact a data.frame; that's usually
a crucial distinction. There are two things you might try:
Dennis' way:
lm(as.matrix(a) ~ b)
David's way:
for(i in
Peter, it works!!! Thanks a lot to all of you!
Yes I mistook a data.frame for a matrix
Now both David's and Dennis' solutions work!
I am really a beginner with R, and I think it's a wonderful tool, but
sometimes
a little difficult to use only learning from the manuals and help files...
I
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