[R] "CV" for log normal data

[Peter Langfelder]

>
> 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