Kristi, It's a little unclear what exactly you're trying to do. However, I recently wanted to run a series of ANOVAs in a for loop and found this R Help thread useful: http://tolstoy.newcastle.edu.au/R/e6/help/09/01/2679.html
I also found Chapter 6 of the following book helpful: Zuur, A. F., E. N. Ieno, N. J. Walker, A. A. Saveliev, and G. M. Smith. 2009. Mixed Effects Models and Extensions in Ecology With R. Springer. If you need more help, I'd suggest sending some sample data and what code you've written so far with specifics about the problems you're having. Hope that helps, Adam On 4/24/2012 8:17 AM, Kristi Glover wrote: > Hi everyone, I am writing this to get your help. I have a big data set and I > wanted to do multiple regression and repeat this process several timesfor > example (data)where y: dependent variables ; number of columns are 5, nrow = > 1800y temp, preci, growing season days, max temp, min temp region4 23 > 0 127 35 14 NORTH AMER10 > 35 21 120 32 17 NORTH > AMER1 18 1 90 27 12 > EUROPE........... > 1) here I wanted to do linear regression (simple regression) using each > predictor (temp, preci, growing season days, max temp... etc), > separatelyafter that, I want to second quadratic regression using each > predictor, and third - polynomial (cubic)2) I wanted to compare the models > (linear, quadratic and cubic) and chose the best model 3) I wanted to do > multiple regression using the best model of each variable Further, I wanted > to divide the data into groups by region. and, then perform the above > analysis for each group (by region)and, I wanted to compare the residuals > between the models where I have been using all data set and the models by > region > I was trying to do manually, but it is taking so much time. I think it is not > difficult and does not take time to write script in R. I was trying to make > loop but I could not succeedI would be very grateful if you help me how I can > write script (loop function) and compute the analysis in R. Thanks for your > support. > Sincerely, > Kristi GloverUniversity of Windsor, Windsor, Canada > > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. -- Adam Zeilinger Post Doctoral Scholar Department of Entomology University of California Riverside www.linkedin.com/in/adamzeilinger [[alternative HTML version deleted]] ______________________________________________ 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.
