Example in The R Programming Language
library(affy) if (require(affydata)) { data(Dilution) } y <- (exprs(Dilution)) x11 ma.plot( rowMeans(log2(y)), log2(y)-log2(y), cex=1 ) title("Dilutions Dataset (array 20B v 10A)") library(preprocessCore) #do a quantile normalization x <- normalize.quantiles(y) x11 ma.plot( rowMeans(log2(x)), log2(x)-log2(x), cex=1 ) title("Post Norm: Dilutions Dataset (array 20B v 10A)") Post Normalization MA Plots.Read more about this topic: MA Plot
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