[R] using ddply with segmented regression

[Jess Inskip]

Hi Paul,

Thanks for starting this thread.  
I have been struggling with the same plyr problems. 

I have also had some trouble moving onto the next step -
integrating the segmented output with 
ggplot2 or lattice.  Have you had any luck in this? 
There is good documentation on adding lm into 
ggplot, but I am not sure how to go about adding in 
the segmented components.  I have looked into 
the plot.segmented documentation to try to recreate 
the plot call, but I have not had much success 
parsing through the code.  

Thanks a lot,
Jessica