Hi Mark, Try this to get you started:
table(roe1 > median(roe1), roe0 > median(roe0)) Hadley On Sun, Jul 4, 2010 at 6:29 AM, Mark Carter <mcturra2...@yahoo.co.uk> wrote: > I'm not very good at statistics, but I know enough to be dangerous. I'm > completely new to R, having just discovered it yesterday. Now that the > introductions are out of the way ... > > I have a table with three columns, only two of which are relevant to the > discussion: roe0 and roe1. Plotting roe0 against roe1 shows that there is a > convincing correlation between them, and is confirmed by the correlation > coefficient. So far, so good. What I'd like to do is answer the question: > what is the probability that roe1 is above the median (of roe1) given that > roe0 is above the median (of roe0). Is there a simple way of doing this in R? > > > > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.