[R] Fitting weighted polynomial regression model

cruz cruadam at gmail.com
Mon Dec 29 22:53:28 CET 2008


I have a simple question but I just couldn't find the right way to do
it after 3 hours of hacking and google.

How do I fit a weighted polynomial regression model to my plot?

This is what I got so far:

> lines(loess(A~B + I(B^2),weights=1/B^2))
Error in xy.coords(x, y) : 'x' and 'y' lengths differ
In addition: Warning messages:
1: pseudoinverse used at 0.52416 0.029047
2: neighborhood radius 3.8766
3: reciprocal condition number  4.3293e-017
4: There are other near singularities as well. 19.538

Any idea would be appreciated.


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