[R] polynom Fit

[Rafael A. Irizarry]

On Mon, 5 Aug 2002, E.A. Welge wrote:

> Please, I'm a beginner with the R language. I'm looking for a function to
> compute a Polynomfit for simple x-y Data. Who can help?
> 
> Many Greetings
> E.A. Welge

if you want least squares look at the help files for "lm" and "poly".
poly creates a basis matrix for polynomials evaluated at x 
lm does least squares fitting.

here is an example:

x <- 1:100   #simulated data
y <- rnorm(100)
n <- 4      #degree of polynomial
fit1 <- lm(y~poly(x,degree=n)) ##fit to data
plot(x,y)  #examle plot
lines(x,fitted(fit1))


hope this helps,
rafael


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