If you want to draw the global regression line in each panel, you can try
xyplot(T~A|speaker,data=spk0,layout=c(4,5),type='p',groups=fns),
panel=function(x,y,...){
panel.xyplot(x,y,...)
panel.abline(lm(y~x,data=spk0))})
Weidong Gu
2011/10/16 ??? <feb211 at naver.com>:> I'd like to draw a lattice plot with groups. The groups (the grouping
condition, fns) are successfully marked with separate symbols, using the
following code:
>
xyplot(T~A|speaker,groups=fns,pch=1:3,key=list(space="right",points=list(pch=1:3)),type=c("g","p","r"))
> Here's a hard part. This draws regression lines for each group in each
panel (there are three groups, so three regression lines show up in each panel).
But I want to have only one global regression line for all groups together,
still maintaining separate symbols for each group.
> I don't want to have individual regression lines for each group.
> I tried many things, with various panel functions, but I've never
succeeded. Could any expert help with this? I'd appreciate it greatly. The
closest I could find was something like the following, which didn't work for
me - anyways, it is supposed to draw by-group regression lines as well as the
global one. So this is not exactly I need.
> xyplot(T~A|speaker,data=spk0,layout=c(4,5),type='p',groups=fns),
> panel=function(x,y){
> ?panel.superpose(x,y)
> ?panel.abline(lm(y~x))}),
> panel.groups=function(x,y,lty){
> ?panel.xyplot(x,y,lty=lty)
> ?panel.abline(lm(y~x),lty=3)})
> Thanks so much !!!
>
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