[BioC] Estrogen Data

[Laurent Gautier]

On Sun, Nov 30, 2003 at 09:50:07PM +0100, Bernd Holleczek wrote:
> Dear experts, 
> 
> I am a beginner in working with R/Bioconductor. At the moment I try to get
> familiar with microarray analysis.
> 
> When loading the Estrogen-Data into an AffyBatch, the number of probes of an
> array is 640*640=409600.
> If I calculate the overall amount of pm and mm-values for all probesets of
> an array, I get as result  2*201800=403600.
> 
> What is an explanation for this difference or what are the other probes
> necessary for?

There are probes that are not PMs nor MMs. For what we know, some of them are
used to align a grid during the image analysis step. A cute
example dealing with these "unknown" probes can be found in an article about
the affy package (Bioinformatics, in press).



Hopin' it helps,


L.

> 
> I'll appreciate suggestions on this question.
> Thanks.
> 
> Regards,
> 
> Bernd Holleczek
> 
> -- 
> Bernd Holleczek <bernd.holleczek at gmx.de>
> 
> HoHoHo! Seid Ihr auch alle schön brav gewesen?
> 
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Laurent Gautier			CBS, Building 208, DTU
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