Displaying 1 result from an estimated 1 matches for "tp3690828p3691143".
2011 Jul 24
1
a question on plotting nonlinear regression
Hi to all the people,
I'm having a trouble when trying to plot a quadratic function. I have the
code:
regression<-nls(Survival~beta1+beta2*PI+beta3*PI^2, data=cubs,
start=list(beta1 = 1, beta2 = 1, beta3 = 1))
plot(Survival~PI,data=cubs, ylab="Survival", xlab="PI")
lines(cubs$PI, fitted(regression))
but the plotted line is not the quadratic one, rather it appears a