[R] Polynomial fitting

[Dimitris Rizopoulos]

try this:

y <- c(15.51, 12.44, 31.5, 21.5, 17.89, 27.09, 15.02, 13.43, 18.18, 
11.32)
x <- seq(3.75, 6, 0.25)
coef(lm(y ~ x + I(x^2) + I(x^3)))


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Jonas Malmros" <jonas.malmros at gmail.com>
To: <r-help at r-project.org>
Sent: Monday, January 07, 2008 4:15 PM
Subject: [R] Polynomial fitting


>I wonder how one in R can fit a 3rd degree polynomial to some data?
>
> Say the data is:
>
> y <- c(15.51, 12.44, 31.5, 21.5, 17.89, 27.09, 15.02, 13.43, 18.18, 
> 11.32)
> x <- seq(3.75, 6, 0.25)
>
> And resulting degrees of polynomial are:
>
> 5.8007  -91.6339  472.1726 -774.2584
>
> THanks in advance!
>
>
>
> -- 
> Jonas Malmros
> Stockholm University
> Stockholm, Sweden
>
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