[BioC] Plot signal distribution in miRNA arrays

[Paul Geeleher]

hist(data[,arrayNumer], breaks=100)

where data is your matrix of expression values and arrayNumber is
whatever column you want to print a histogram for, breaks is the
number of bars on the histogram. You could also use a density plot but
that has smoothing applied which may not be what you want.
Shapiro–Wilk test is a commonly used test for normality.

Paul.

On Wed, Aug 3, 2011 at 10:52 AM,  <andrea.grilli at ior.it> wrote:
> Hi to all,
>
> I would like to plot signal distribution from miRNA array experiment, one
> only plot for all arrays. Any suggestion on how to perform it? Is there some
> easy way to check how this data fit a normal distribution (e.g. with K-S
> test)?
>
> Data comes from Agilent Human miRNA v.2, normalized with quantile method and
> log2 transformed.
>
> Thanks in advance,
> Andrea
>
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-- 
Paul Geeleher (PhD Student)
School of Mathematics, Statistics and Applied Mathematics
National University of Ireland
Galway
Ireland
--
www.bioinformaticstutorials.com