[R] rms package-superposition prediction curve of ols and data points

[achaumont]

Hello, 

I have a question about the “plot.predict” function in Frank Harrell's rms
package.
Do you know how to superpose in the same graph the prediction curve of ols
and raw data points?
Put most simply, I would like to combine these two graphs:

>  fit_linear <- ols (y4 ~ rcs(x2,c(5,10,15,20,60,80,90)), x=TRUE, y=TRUE)
> p <- Predict(fit_linear,x2,conf.int=FALSE)
> plot (p, ylim =c(-2,0.5), xlim=c(0,100))		# graph n°1

> z <- plot (x2,y4,ylim=c(-2,0.5),xlim=c(0,100),type="p",lwd=6,col="blue")      
> # graph n°2

Thanks all, 

Agnès



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