[R] question in xyplot of lattice

From: Aimin Yan <aiminy_at_iastate.edu>
Date: Fri, 07 Dec 2007 13:08:40 -0600

I try to make a xyplot like the following:

xyplot(y1+y2~id|groups, ...)

I also want to calculate cor(y1,y2) in each group, print it on each panel.

Does anyone know how to write panel function for this?



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