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wherein
2006 Jun 08
1
panel.abline and xyplot
Dear All,
I am wondering on how to use the abline.xyplot with xyplot such that I will have different vertical lines for each panel. More sepcifically, suppose that the xyplot generates 4 panels defined by the combination of two binary variables: X_1 and X_2. i.e.
xyplot(Y ~ Z | X_1*X_2, data = df)
I want something like:
abline(v = 5) if X_1=0 and X_2 = 0
abline(v =