How should I pass abline to this function so that I get a reference line
at h=0 in each panel?
sps <- trellis.par.get("superpose.symbol")
sps$pch <- 1:10
trellis.par.set("superpose.symbol",sps)
xyplot(fcast$LOGDIFF~fcast$VINTAGE|fcast$REGION,
groups=fcast$LAG,
panel=panel.superpose,
type="b",mfcol=c(3,5),
key=list(columns=3,
text=list(paste(c("forecast: ", "",""),
unique(fcast$LAG), "years")),
points=Rows(sps,1:3)))
Cheers,
JC
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