[R] plotting polynomial regression line

Amit amitkumartiwary at gmail.com
Sun Dec 20 19:35:09 CET 2009


Dear All,
I am trying to plot polynomial regression line to a scatterplot. I did
following so far:

>x=c(1:9335)
>y=read.table("gp.txt",header=T,sep="\t")
> length(y$PCC) # y$PCC has values between 1 to 0 in decreasing order
[1] 9335
> plot(x,y$PCC,col="red") #scatterplot between x and y$PCC
> reg=lm(y$PCC~poly(x,6)) # calculating polynomial fit with degree 6
> abline(reg,col="blue")
Warning message:
In abline(reg, col = "blue") :
  only using the first two of 7regression coefficients

After the above warning a line is drawn in the graph parallel to the
y-axis. But I was expecting a curve line through the scatterplot.
Am I doing something wrong? Please help!

Best
Amit



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