Re: S-plus: Adding abline to bwplot or boxplot with log scales

["Tat, Tri Vi (TGRD)" <TTat@tgrd.com>]

Dear splus users
I wish to produce a boxplot with a log scale (because it's a 
proportional difference) and with an overlaid abline (set at 1)

1. The splus boxplot command ignores log="y".
2. The splus bwplot command allows log scale via specifying 
scales=(list(log=F)), but then it ignores the command abline or 
panel.abline when the scale is logged.

I can achieve the plot in R using boxplot because it recognises the 
log="y" option.
How do I do it in splus? 
Please find code below.

Thanks for your anticipated advice.
Tri
========================================
Example code:

#Data 
data<-data.frame(values=exp(rnorm(20, .2, .5)), # within-subject
proportional differences
        group=rep(c("A","B"),each=10) # stratification
) 

#boxplot -- fails because it ignores the log scale request
boxplot(split(data$values,data$group),log="y")
abline(h=1,lwd=1,lty=4,col=5) 

# bwplot -- fails because it ignores abline
bwplot(group~values,data=data,
        scales=list(x=list(log=T)),
)
abline(v=1,lwd=1,lty=4,col=5)

# bwplot -- again fails because it ignores abline
bwplot(group~values,data=data,
        panel=function(x,y,...){
                panel.bwplot(x,y)
                panel.abline(v=1,lwd=1,lty=4,col=5)
        }
)

Whereas in R, the following is successful because it recognises log="y":
boxplot(split(data$values,data$group),log="y")
abline(h=1,lwd=1,lty=4,col=5)



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