Tricky eh. One of the problems with Slope graphs is that they get messy very quickly. This is turn makes it hard to decipher whats going on. You only have a small window of engagement with your audience so making them work hard for the answer just isnt on. So here's a quick rule of thumb.
If the number of lines in the chart is greater than 5 then you need to have interactivity/highlighting/colourcoding
If its less than 5 then you can get away with a static display.
Remember, you are creating a dataviz, not a game of pick up sticks.
Tableau Zen Master, Social Ambassador, Wrangler of Data, Vizzer of Data
This article is interesting.
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