[BioC] Meaning of Median and IQR in MA-Plot, Affy Package

[Sean Davis]

On Wed, Jan 30, 2013 at 8:56 AM, Gundala Viswanath <gundalav at gmail.com> wrote:
> Using this code to generate MA-Plot.
> What is the meaning of Median and IQR?

Hi, Gundala.

Are you asking about the median and IQR in the code, because I do not
see one?  If you are asking about the definition of median and
interquartile range (IQR), you would probably be well-served by doing
a little bit of reading on these two quantities.

Sean

> 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.
>
>         [[alternative HTML version deleted]]
>
> _______________________________________________
> Bioconductor mailing list
> Bioconductor at r-project.org
> https://stat.ethz.ch/mailman/listinfo/bioconductor
> Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor