Dear all, I am a stata user and I am moving my first steps in R. I am dealing with a silly issue concerning looping over variables. I read previous posts on similar topics in the R help archive, but I did not find a solution. Here is my case:
I run a simple bivariate linear regression saving the output in objects called: pd.memb.0, pd.memb.1, pd.memb.2, pd.memb.3 pd.memb.0 <- lm(E.fs.memb ~ M.fs.memb, data, subset = (tag2 == 1)) pd.memb.1 <- lm(E.fs.memb ~ M.fs.memb, data, subset = (M.fs.memb <= quantile(M.fs.memb, .25) & tag2 == 1)) pd.memb.2 <- lm(E.fs.memb ~ M.fs.memb, data, subset = (M.fs.memb > quantile(M.fs.memb, .25) & M.fs.memb <= quantile(M.fs.memb, .75) & tag2 == 1)) pd.memb.3 <- lm(E.fs.memb ~ M.fs.memb, data, subset = (M.fs.memb > quantile(M.fs.memb, .75) & tag2 == 1)) Subsequently, I wish to plot my data superimposing a different line for each regression model. Here I am trying to apply my loop. Looking at the info I found around, the following code sound to me as correct, but I am wrong. plot(M.fs.memb , E.fs.memb) for(i = 1:3){ curve(coef(pd.memb.i)[1] + coef(pd.memb.i)[2]*x, add = T, cex = 100, col = "red") } The plot is plotted, but the curves are not printed and I get the following error message: Error in coef(pd.memb.i) : error in evaluating the argument 'object' in selecting a method for function 'coef'> }Error: unexpected '}' in "}" What am I doing wrong? Thanks a lot for your help, f. [[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.