I have no idea what 'demo' this is. When I open R it says Type 'demo()' for some demos, 'help()' for on-line help, or 'help.start()' for an HTML browser interface to help. and this is none of those. At a guess you meant x <- 1:20 w <- 1 + sqrt(x)/2 dummy <- data.frame(x=x, y= x + rnorm(x)*w) dummy fm <- lm(y ~ x, data=dummy) from the 'sample session' in 'An Introduction to R'. In which case, this is your own typing error (- for ~, and we do put spaces in to make it easier to read). Please do read the R FAQ *before* 'blowing off' a false report.
On Mon, 24 Dec 2007, rcwright at texas.net wrote:
Full_Name: richard wright Version: R version 2.6.1 (2007-11-26) OS: Mac OS X v 10.4.11 Submission from: (NULL) (76.240.79.123) I downloaded the most recent version of R for the mac (About: GUI 1.22-devel (4859) (4859)) and installed it. After installation, I opened the help file and ran the demo. I am new to R, although I have over 25 years experience in SAS. Below is a part of the job I ran. I think I ran the code correctly, but I seem to be blowing off. And, I'm not sure it's related, but I also included what I got when I ran bug.report()
dummy <- data.frame(x=x, y =x+rnorm(x)*w) dummy
x y 1 1 1.425904 2 2 -1.083024 3 3 -1.976215 4 4 4.185795 5 5 8.598591 6 6 1.004177 7 7 5.357826 8 8 9.033184 9 9 6.455373 10 10 8.166066 11 11 12.383454 12 12 10.823910 13 13 14.410394 14 14 13.046184 15 15 15.912303 16 16 13.454527 17 17 15.827133 18 18 18.586979 19 19 10.845216 20 20 20.935347
fm <-lm(y-x,data=dummy)
Error in switch(mode(x), "NULL" = structure(NULL, class = "formula"), : invalid formula In addition: Warning message: In y - x : longer object length is not a multiple of shorter object length
ls()
[1] "dummy" "w" "x" "y"
bug.report()
Error in bug.report() : 'subject' missing
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