Using this code to generate MA-Plot.
What is the meaning of Median and IQR?

library(affy)

if (require(affydata))
{
     data(Dilution)
}

y <- (exprs(Dilution)[, c("20B", "10A")])

x11()

ma.plot( rowMeans(log2(y)), log2(y[, 1])-log2(y[, 2]), cex=1 )


- G.V.

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