Tianchan -
Your X is not a matrix -- it's a dataframe. Probably the
simplest solution is to use
lm(y~as.matrix(X))
but you should also learn the difference between a data frame
and a matrix.
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Tue, 16 Nov 2010, Tianchan Niu wrote:
Dear All,I would like to do multiple regression in R. I used: lm(y~X),
where y is a n by 1 vector, and X is a n by m matrix. I kept getting the error
message:Error in model.frame.default(formula = y ~ X, : invalid type (list)
for variable 'X'. However, when I used: lm(y~X[,1]+X[,2]+X[,3]+…+X[,m]), it
works well, but this is not the form I prefer, it makes my codes
complicated.Please help.Thank you very much,Jane
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