[R] plotting predicted values (lines) over data?

[Liaw, Andy]

> From: Jeff D. Hamann
> 
> I've been trying to plot the predicted values, as a line, 
> over the data for
> a simple nonlinear fit with the following commands:
> 
> plot( hg ~ ht )
> ... define some function hg ~ ht + junk ...
> ... blah, blah, obtain parameter estimates and predicted 
> values, blah...
> ... then...
> lines( sort( $predicted ) ~ sort( ht ) )

This doesn't look right to me.  Don't you want something like:

  ord <- order(ht)
  lines(ht[ord], fit$predicted[ord], ...)

???

Andy

 
> which results in a line that isn't smooth (which I knew would 
> happen). I've
> checked the FAQ,docs and archives and I'm not sure if there's 
> function that
> will so what Heut et. al (2004) do with their plfit(). So, is 
> there already
> an R function, or process to do this, or will I have to write one?
> 
> Thanks,
> Jeff.
> 
> ---
> Jeff D. Hamann
> Forest Informatics, Inc.
> PO Box 1421
> Corvallis, Oregon USA 97339-1421
> (office) 541-754-1428
> (cell) 541-740-5988
> jeff.hamann at forestinformatics.com
> www.forestinformatics.com
> 


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