I’m trying to plot regression lines using curve() The way I do it is:
bs <- coef(fit2) and then for example: curve(bs["(Intercept)"]+bs["mies"]*0+bs["kouluB"]+bs["lka"]*x+bs["kouluB:clka"]*clka, from=min(lka), to=max(lka), add=TRUE, col='red') This above code runs into error: Error in curve(bs["(Intercept)"] + bs["mies"] * 0 + bs["kouluB"] + bs["lka"] * : 'expr' did not evaluate to an object of length 'n' In addition: Warning message: In bs["(Intercept)"] + bs["mies"] * 0 + bs["kouluB"] + bs["lka"] * : longer object length is not a multiple of shorter object length Which I’ve investigated might be related to the lengths of the different objects being multiplied or summed. Taking length(g$x) or length(g$y) of g <- curve(bs["(Intercept)"]+bs["mies"]*0+bs["kouluB"]+bs["lka"]*x, from=min(lka), to=max(lka), add=TRUE, col='red') returns 101. However length(lka) is 375. But perhaps these being different is not the problem? I however do see that the whole range of lka is not plotted, for some reason. So how can I be sure that it passes through all x-values in lka? And i.e. that the lengths of objects inside curve() are correct? What can I do? ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
