Is there a term similar to quartile for a range of values split into thirds? Something other than lower, middle, and upper?
Though pretty rare, I have seen tertile.
That’ll do, thanks!
Found this as well.
Like JeffB, I’ve heard, terciles are thirds, quartiles are quarters, and quintiles are fifths.
You could also use n-tiles to represent a split into n pieces–it’s not standard, but everyone would probably know what you’re talking about.