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polynom Fit

2 messages · E.A. Welge, Rafael A. Irizarry

Original
E.A. Welge
# 
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

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

            

      
      
      
    

        
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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