[R] fitting curve to data

[Simon Blomberg]

First, try plot(x,y)


If you want to use nls, you have to specify a nonlinear function to fit
to your data. See ?nls.

If you are really stuck on how to fit regression models, you should
consult a statistician (CSIRO has a lot of expertise).

Simon.

On Mon, 2009-01-12 at 12:19 +1000, Nathan S. Watson-Haigh wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> I have the following data:
> 
> > y
>  [1] 0.000 0.004 0.008 0.016 0.024 0.032 0.044 0.064 0.072 0.088 0.108 0.140
> [13] 0.156 0.180 0.208 0.236 0.264 0.296 0.320 0.360 0.408 0.444 0.472 0.524
> [25] 0.576
> > x
>  [1]  100  200  300  400  500  600  700  800  900 1000 1100 1200 1300 1400 1500
> [16] 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500
> 
> I'd like to plot the points and calculate a curved line of best fit. I know I need to use nls(), but
> I'm unsure how to begin....any pointers?
> 
> Cheers,
> Nathan
> 
> 
> - --
> - --------------------------------------------------------
> Dr. Nathan S. Watson-Haigh
> OCE Post Doctoral Fellow
> CSIRO Livestock Industries
> Queensland Bioscience Precinct
> St Lucia, QLD 4067
> Australia
> 
> Tel: +61 (0)7 3214 2922
> Fax: +61 (0)7 3214 2900
> Web: http://www.csiro.au/people/Nathan.Watson-Haigh.html
> - --------------------------------------------------------
> 
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.9 (MingW32)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
> 
> iEYEARECAAYFAklqqJsACgkQ9gTv6QYzVL4gCgCgy4qShoFX/9QWgKsBqHPhLCDS
> r+AAnRD3kbkImG3rVaBN6d4BP2cUmqYZ
> =yVLj
> -----END PGP SIGNATURE-----
> 
> ______________________________________________
> R-help at 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.
-- 
Simon Blomberg, BSc (Hons), PhD, MAppStat. 
Lecturer and Consultant Statistician 
Faculty of Biological and Chemical Sciences 
The University of Queensland 
St. Lucia Queensland 4072 
Australia
Room 320 Goddard Building (8)
T: +61 7 3365 2506
http://www.uq.edu.au/~uqsblomb
email: S.Blomberg1_at_uq.edu.au

Policies:
1.  I will NOT analyse your data for you.
2.  Your deadline is your problem.

The combination of some data and an aching desire for 
an answer does not ensure that a reasonable answer can 
be extracted from a given body of data. - John Tukey.