[R] grouped lattice plot with overall regression line

[Weidong Gu]

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 조혜선 <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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