Thank you Peter.

John



________________________________
 From: Peter Langfelder <peter.langfelder@gmail.com>
To: Bert Gunter <gunter.berton@gene.com> 

Sent: Tuesday, February 21, 2012 2:51 PM
Subject: Re: [R] "CV" for log normal data
 
>
> 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
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