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?

Thanks

John
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