Thanks Dieter for the help. This is how I want plot(log(test$conc),fn(test$conc,15,3.5,600,1/2.5),type="l") # looks good
points(log(test$conc),log(test$il10)) regards and happy holidays sharad -- View this message in context: http://r.789695.n4.nabble.com/understanding-the-4-parameter-logisitc-regression-tp3091588p3092628.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
