Regression Discontinuity Design

The regression discontinuity design allows the analyst to estimate a local average treatment effect at a policy cutoff when there is no discontinuous sorting andno other determinant of the outcome variable changes discontinuously at the same threshold.

It's a particularly credible method for estimating a causal relationship but generalizability is limited.

Here is a nice presentation on regression discontinuity. And here is Imbens and Lemieux's guide to regression discontinuity.

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Regression Discontinuity Design RD