Hi list
I am running this ggplot2 R code:
http://www.r-bloggers.com/an-enhanced-kaplan-meier-plot/

with its graphical output looks like this:
http://statbandit.files.wordpress.com/2011/03/rstudio-v79384.pdf


It gives me this error:
ggplot2 doesn't know how to deal with data of class function

I looked around seems like it's a common problem, but haven't found a
solution.
Thanks,
Mike

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