Hi, Kristi-
Here is an option.
?curve...to add the polynomials to your graph
?text....for adding the R2 to you plot
Ken
On 06/13/12, Kristi Glover wrote:
>
> Hi R experts,
> Could you please help me to fit a linear, cubic and quadratic curve in a
> figure? I was trying to show all these three fitting curves with different
> colour in one figure.
> I spent substantial time to figure it out, but I could not.
>
> I have given here a example and what I did for linear, but no idea for cubic
> and quadratic fitting curve
>
>
> > dput(test)
> structure(list(sp = c(4L, 5L, 9L, 12L, 14L), env = c(12L, 18L,
> 20L, 17L, 15L)), .Names = c("sp", "env"), class = "data.frame", row.names =
> c(NA,
> -5L))
> > plot(test$sp~test$env, main = "S vs. temp", xlim=c(0,20), ylim=c(0,14),
> > ylab="S",xlab="env")
> > linear<-lm(test$sp~test$env)
> > quadratic<-lm(test$sp~test$env+I(test$env^2))
> > #summary(quadratic)
> > cubic<-lm(test$sp~test$env+I(test$env^2)+I(test$env^3))
> > #summary(cubic)
> > #fitting curve
> > abline(linear)
> >
> Here I did for linear, but now I don't how I can plot quadratic and cubic
> line in the figure with different colour. I further wanted to put r2 value on
> the top of the fitting line.
> ON linear fitting curve, I can see the line originated from left to right
> (cover whole x axis). I could not plot the line only within the data set.
> Would any one help me to figure it? I think it is not difficult but for me-
> it is really taking time.
>
> Thanks and waiting for your suggestions
>
> sincerely,
> Kristi Glover
>
>
>
>
> [[alternative HTML version deleted]]
>
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