Adding labels within lattice panels by group

February 18, 2014
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(This article was first published on mages' blog, and kindly contributed to R-bloggers)

The other day I had data that showed the development of many products over time. I grouped the products into categories and visualised the data as line graphs in lattice. But instead of adding an extensive legend to the plot I wanted to add labels to each line's latest point. How do you do that? It turns out that panel.groups is there to help again.

Here is my solution:

R code

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