Create boxplots of M or M vs A plots. Where M is determined relative to a specified chip or to a pseudomedian reference chip.
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Additional parameters for the routine 
A 
A vector to plot along the horizonal axis 
M 
A vector to plot along vertical axis 
subset 
A set of indices to use when drawing the loess curve 
show.statistics 
If true some summary statistics of the M values are drawn 
span 
span to be used for loess fit. 
family.loess 

cex 
Size of text when writing summary statistics on plot 
mva.pairs
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