On Feb 14, 2010, at 6:33 PM, Andrew McFadden wrote:
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,
Seems likely that you want the dataframe defined above to be used as
the argument to
'data='. Otherwise xyplot throws an error unless "tavg" is defined
elsewhere.
If so, then try:
tavg=data.frame(a,b,c)
xyplot(a~b, pch=c(6,8),data = tavg, groups=c,
panel=function(x,y, groups,...) {
panel.xyplot(x,y,groups,type=c("p"),...);
panel.lmline(x[c=="2"],y[c=="2"],groups,...)},
xlab="a",ylab="b")
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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