If you know the period of the sine that you want to fit (just fitting the amplitude, phase shift, and offset) and are willing to assume normal errors (or at least normal enough for the CLT) then you can just use the lm function. If you need to find the period as well (but still willing to assume normal enough errors) then you can use the nls function. You can approximate with splines and lm for another approach.
No packages (other than the automatic ones) needed. If you are not willing to assume normal enough errors, then we will need more data to be able to help. -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [email protected] 801.408.8111 > -----Original Message----- > From: [email protected] [mailto:r-help-boun...@r- > project.org] On Behalf Of ashz > Sent: Monday, October 18, 2010 6:46 AM > To: [email protected] > Subject: [R] Sine function fitting > > > Hi, > > Is there a package to perform a sine function fitting to XY data? > > Thx, > Ashz > > -- > View this message in context: http://r.789695.n4.nabble.com/Sine- > function-fitting-tp3000156p3000156.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > [email protected] 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. ______________________________________________ [email protected] 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.
