Duncan, Great, many thanks, it works.
Best, Le samedi 9 janvier 2021 à 21:13:30 UTC+1, Duncan Murdoch <murdoch.dun...@gmail.com> a écrit : Your x values aren't in increasing order. When you plot lines(x, yfit), it joins the points in the order you give them, which jumps back and forth. To fix, try o <- order(x) lines(x[o], yfit[o], col="green", lwd=2) Duncan Murdoch On 09/01/2021 2:58 p.m., varin sacha via R-help wrote: > ############################## > #DATA > y<-c(499,491,500,517,438,495,501,525,516,494,500,453,479,481,505,465,477,520,520,480,477,416,502,503,497,513,492,469,504,482,502,498,463,504,495) > x<-c(499,496,424,537,480,484,503,575,540,436,486,506,496,481,508,425,501,519,546,507,452,498,471,495,499,522,509,474,502,534,504,466,527,485,525) > > #PLOT > plot(x,y) > > #GAM > library(mgcv) > fit3=gam(y~s(x,bs='ps')) > x.new<- seq(range(x)[1], range(x)[2], len=1000) > gamfit.new <- as.vector(predict.gam(fit3,data.frame(x=x.new),type="response")) > lines(x.new, gamfit.new, col="red", lwd=2) > > # LOESS > mod=loess(y~x, span=0.8) > yfit=predict(mod,newdata=x) > lines(x,yfit,col="green",lwd=2) > ############################## ______________________________________________ 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.
