On Apr 26, 2009, at 8:40 PM, Ronnen Levinson wrote:
Hi.
Is there an analog to abline() that can be used to plot a polynomial
fit?
For example, I can draw the straight-line fit
fit <- lm(y ~ x)
via
abline(coef=fit$coef)
but I'm not sure how to draw the polynomial fit
fit <- lm(y ~ poly(x,2))
I do see the function curve(), but not how to prepare an expr for
curve() based on the coefficients returned by the polynomial fit.
Thanks for your help,
Use instead the predict function. Something like:
lines(x=seq(min(x), max(x), length=100), y= predict( fit,
newdata= ....) #insert properly constructed dataframe
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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