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2010 Feb 13
3
Plot different regression models on one graph
The following variables have the following significant relationships (x is the explanatory variable): linear, cubic, exponential, logistic. The linear relationship plots without any trouble.
Cubic is the 'best' model, but it is not plotting as a smooth curve using the following code:
cubic.lm<- lm(y~poly(x,3))
lines(x,predict(cubic.lm),lwd=2)
How do I plot the data and the estimated