I have a data set that looks roughly like this:
Station | Group | Date | Value | Parameter
1 | St1 | A | 2015-03-03 | 25 | N
2 | St2 | A | 2015-04-03 | 25 | N
3 | St3 | B | 2015-03-05 | 25 | N
4 | St4 | C | 2015-06-03 | 25 | N
I am creating a plot that is faceted by group. X axis is the date, Y the value. I am trying to color code the Stations (unique color per station) by facet. Right now I can make all the stations have a unique color, but over the entire data set there are a ton of stations so its very hard to see the differences. Each group though only has about 5-8 stations each.
What I'm trying to accomplish is a way to use the same 5-8 colors in each facet, even though they will correspond to different stations. I'm totally stumped on this, any help is appreciated!!