[BioC] coefficient of variation for Agilent chip log ratio data

James W. MacDonald jmacdon at uw.edu
Wed Feb 22 14:42:48 CET 2012


Hi John,

On 2/21/2012 4:44 PM, array chip wrote:
> Hi, I have a microarray dataset from Agilent chips. The data were really log ratio between test samples and a universal reference RNA. Because of the nature of log ratios, coefficient of variation (CV) doesn't really apply to this kind of data due to the fact that mean of log ratio is very close to 0. What kind of measurements would people use to measure the dispersion so that I can compare across genes on the chip to find stably expressed genes? something similar to CV would be easily interpreted?

Standard deviation.

Best,

Jim


>
> Thanks
>
> John
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>
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