[R] Weired location of points on MA plot?

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Dear all,

 I have a MA plot for "replicate" single channnel arrays, the loess curve is
aligned to M=0. However,  I expect that M values be as close as possible to
M=0 for replicate arrays, which is not the case. How may I obtain a measure
that indicates the average distance of points to M=0?

Thanks indeed.

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