$ q_{bg2}$

According to [5], problematic regions on a microarray slide often have higher than average background noise. This is measured by $ q_{bg2}$ given by:

$\displaystyle q_{bg2}=f_2 \cdot \frac{BO_{mean}}{B_{mean}+BO_{mean}} ,$    

where $ f_2$ is a normalisation constant given by

$\displaystyle f_2=\frac{1}{\max\{\frac{BO_{mean}}{B_{mean}+BO_{mean}})\}},$    

and $ BO_{mean}$ is the average of the background intensities for all spots on the array.



Bjørn Kåre Alsberg 2006-04-06