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The Benefits of Using Evidence From Other People
There might be many, many factors that determine whether someone went to that college or not. But if you look at people who fall just below the testing cut-off and those just above it, they are very unlikely to differ in any particular way. And so we can then study the effects of going to that school. Is that they do? We can, but there's a huge gain from being able to make that causal inference even in that specific scenario.