Hi R users

> I am trying to add a regression line to a graph for "c" for factor 2
> only. Any suggestions?
> 
library(lattice)

a=(1:10)
b=c(1:5,16:20)
c=as.factor(c(rep(1,5),rep(2,5)))

d=data.frame(a,b,c)

xyplot(a~b, pch=c(6,8),data = tavg, groups=d$c,
reg.line=lm, smooth=FALSE, type=c("p","g"),xlab="a",ylab="b")

> I would appreciate your help.
> 
> Kind regards
> 
> andy
> 
> Andrew McFadden MVS BVSc
> Incursion Investigator
> Investigation & Diagnostic Centres - Wallaceville Biosecurity New 
> Zealand Ministry of Agriculture and Forestry
> 
> Phone 04 894 5600 Fax 04 894 4973 Mobile 029 894 5611 Postal address: 
> Investigation and Diagnostic Centre- Wallaceville Box 40742 Ward St 
> Upper Hutt
> 

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