What does your error distribution look like? Have you tried any time series analysis on your data? Your information is too little for us to give any concrete directions.
Regards, Indrajit ________________________________ From: rch4 <r...@geneseo.edu> To: r-help@r-project.org Sent: Wednesday, November 30, 2011 8:37 AM Subject: Re: [R] Negative exponential fit Thank you for your suggestions. We are currently working with an the nls function, but are having trouble getting a curve that fits our data. We have tried using the following formula: mod1 = nls(time~a*exp(b*(date)), start=list(a=4.178,b=-1.18)) av=mdate bv=predict(mod1,list(mdate=av)) length(av) length(bv) lines(av,bv) We've been trying to work with your suggestions but aren't having any luck thus far. We've also tried to exponentiate the times in hopes they would produce a better fit, but can't seem to produce a formula without getting errors. Any further help/explanations would be appreciated. -- View this message in context: http://r.789695.n4.nabble.com/Negative-exponential-fit-tp4117889p4121694.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. [[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.
