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Identifying Fuzzy and Sharp RDDs

Consider the following examples. Which is an example of a fuzzy RDD and which is a sharp RDD?

  1. Running variable: Age. Treatment: You become eligible for senior citizen welfare programs once you are 65 are older.

  2. Running variable: A region's poverty rate. Treatment: Regions become eligible for Federal assistance once their poverty rate is above a certain cutoff.

  3. Running variable: Population. Treatment variable: Number of seats per state/province in a national government when each politician represents a different amount of citizens, like in the U.S. House of Representatives.

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