[BioC] Estrogen Data

[Bernd Holleczek]

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?

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?

GMX Weihnachts-Special: Die 1. Adresse für Weihnachts-
männer und -frauen! http://www.gmx.net/de/cgi/specialmail