> > Good advice. But perhaps ?mad or some other perhaps robust plain old > measure of spread?
The problem is not (lack of) robustness to outliers, the problem is to find genes whose expression variation is small compared to (mean) expression. Trouble is, Agilent throws the mean expression information away, so you have to find heuristic workarounds. I have encountered the same issue before and haven't really found a good solution. Peter ______________________________________________ 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.
