Hi,

I am pretty stumped on how I can approach this problem.  Basically, I have
two groups of boxplots which I would like to overlap on top of each other.
 Each boxplot in a group represents a probeset's expression values.  So when
I overlap them, I would like to see which probesets differ a great deal
between the two groups.  I know that the boxplot function has a parameter
add that when you set to TRUE it will just add the entire boxplot to the
current graph which is what I want.  But sometimes the boxplots will just
completely cover another boxplot.  What would be great is if I could set
transparency, but there doesn't appear to be any parameters to set.

What I would like to do is demonstrated in the Affymetrix technical note:
"Identifying and Validating Alternative Splicing Events" figure 15.

Does anyone have any idea how I could do this?  Any help would be greatly
appreciated.

Fong

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