The regression discontinuity design is

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The regression discontinuity design is a specific form of a non-equivalent control group design. It involves studying the outcome of a treatment or intervention on individuals who are very close to a threshold or cutoff point, where their assignment to the treatment or control group is based solely on whether their score or value falls above or below the cutoff. This design helps to address the issue of selection bias that may arise in non-randomized studies, as those close to the cutoff are likely to be similar in observed and unobserved characteristics.

The Regression Discontinuity Design Is