
         I really like these Trellis graphics but how do I get this code to 
skip the missing?

logreg<-read.csv("logreg.csv", header=TRUE, sep=",", na.string=" ")
attach(logreg)

bwplot(yesno~bc_pcb_tot |varlist, data=logreg, main="Box Cox PCB 
transformation",  auto.key=TRUE, fontfamily = "HersheySans" )


Dean Sonneborn M.S.
Public Health Sciences *
University of California, Davis
916 734-6656

* formerly Epidemiology & Preventive Medicine

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