On May 2, 2012, at 6:14 AM, Johannes Radinger wrote:
Hi,
i want to plot empirical cumulative density functions for two
variables in
one plot. For better visualizing the differences in the two
cumulative curves I'd like to log-scale the axis.
So far I found 3 possible functions to plot ecdf:
1) ecdf() from the package 'stats'. I don't know how to successfully
set the log.scales? Combining two plots is not a problem:
plot(ecdf(x1))
lines(ecdf(x2),col.h="red")
2) gx.ecdf() from package 'rgr'. It is easily possible to plot log-
scales, but I don't know how to plot two densities?
gx.ecdf(x1,log=TRUE,ifqs = TRUE)
3) Ecdf() from package 'Hmisc'. No log-option directly available and
here I also don't know how to 'stack' two plots...
Ecdf(x1,what="F")
Probably there are many more solutions (e.g. ggplot etc.)...
...Has anyone faced a similar task and found a simple solution? Any
suggestions are welcome!
Have you searched the Archives? I seem to remember that the log(0) was
a barrier to persons attempting this in the past. (ISTR a posting in
the last few weeks.) Maybe you could also provide a test data object
that has the same range as your x1 and x 2 variables.
and provide commented, minimal, self-contained, reproducible code.
--
David Winsemius, MD
West Hartford, CT
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