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Thinking about confounders in an RD design

Suppose your friend says "I don’t believe the results in Black (1999) because she doesn't control for whether there is a public park nearby the house. Having a park nearby increases the value of a house. Also, districts that have high test scores also tend to have more parks. So this test score effect might just be because of this unobserved confounder!"

Do you agree, disagree, or partly agree with your friend's statement?

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