Homework? There is a no homework policy on this list. -- Bert
On Sat, Jan 5, 2013 at 3:06 AM, Katarzyna Nurzynska <pa...@nottingham.ac.uk> wrote: > Hi > > I am trying to build a regression model. My data looks like this: > > A B C D E > 1 1 1 2.57 5 > 2 0 0 1.64 3 > 0 5 1 4.8 1 > 1 3 0 3.56 168 > 1 1 1 2.13 1 > 0 3 1 5 168 > 2 0 0 7.75 28 > 4 0 2 2.85 168 > 3 0 1 1.89 6 > 1 1 1 2.33 3 > 3 2 2 1.77 168 > 1 0 0 1.38 0.04 > 0 6 1 4. 11 168 > 2 2 2 2.86 1 > 3 1 1 4.11 168 > 3 0 2 3 84 > 1 1 1 2.5 56 > > where E is a response variable and A, B, C, D are predictor variables. Below > are commands which I enter in R: > > str (mydata) > mydata.lm = lm (E ~ 1, data = mydata) # to create a blank model > add1(mydata.lm, mydata, test='F') # to add the best predictor variable to the > blank model > > However at this point the message appears: > > Warning messages: > 1: In model.matrix.default(Terms, m, contrasts.arg = object$contrasts) : > the response appeared on the right-hand side and was dropped > 2: In model.matrix.default(Terms, m, contrasts.arg = object$contrasts) : > problem with term 4 in model.matrix: no columns are assigned > > What does it mean ? Could you please help ? > > > This message and any attachment are intended solely for the addressee and may > contain confidential information. If you have received this message in error, > please send it back to me, and immediately delete it. Please do not use, > copy or disclose the information contained in this message or in any > attachment. Any views or opinions expressed by the author of this email do > not necessarily reflect the views of the University of Nottingham. > > This message has been checked for viruses but the contents of an attachment > may still contain software viruses which could damage your computer system: > you are advised to perform your own checks. Email communications with the > University of Nottingham may be monitored as permitted by UK legislation. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
