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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 [[alternative HTML version deleted]]