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how would one differentiate between somebody with 20% gmat and gpa, or 90% gmat and gpa? Both of which are neutral split, but a world apart in terms of application strength. Or 80/100 vs 20/40 etc?
How is this difference displayed in the graph?
Good catch--you're hitting at one of the big challenges of data like this

There's no direct indication of the GPA/GMAT on the chart, but in general we can make some assumptions given the avg #s for those schools.
One assumption is important I think here: that "splitters" are randomly distributed throughout the GMAT/GPA curve. If, for example, all splitters were 20/40% like you mention, the chart would be pretty misleading.
But since the chart's split into accept / denies, and the schools publish their ranges, I think it's reasonable to assume that most admits are high on both %s, or _very_ high on one and so-so on the other. An applicant who was low on both would probably be rejected.
Another assumption that could save us here is: the distribution of splitters at one school looks more/less like the distribution at other schools. This would mean that, for the purposes of comparing schools, the effects of what u describe would be minimal.
We're playing w/ diff't ways to display the data though, so thinking through stuff like this is really useful for us--so thanks for taking a second to share your thoughts here