Hello,
I would like to display two groups of dots in different colors or style and
additionnaly a linear regression for all the dots in
panel plots of a Trellis graph. Actually to get in each panel the equivalent of:
plot(x[mois==3],y[mois==3],col="blue")
points(x[mois==9],y[mois==9],col="red")
abline(lm(y~x), col="green")
"mois" being a grouping variable and ID (see below) the conditioning variable in a
data.frame of 230 rows
After several really disatreous trials, I have tried the following:
xyplot(y~x|ID,panel=function(x,y){panel.superpose(x,y,subscripts=1:230,groups=mois);panel.abline(lm(y~x),col="green")})
1/ I am not sure to have well understood what the role of subscripts (with no
default) is in the function panel.superpose and if
the values passed are appropriate here;
2/ this apparently displays all the points without changes of style between groups
(neither symbols or colors).
3/ this does not allow changes in color for points display
Can anybody give me a hint on where I am wrong?
Sorry to be probably very clumpsy,
Kind regards,
Patrick Giraudoux
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