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S7E16 Jumping Into Regression Discontinuity Designs

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Feb 24, 2026
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ANECDOTE

Gaming Enrollment To Get A TA

  • Greg Hancock describes trying to get two extra students to trigger a TA and Patrick jokes about room capacity tricks at Carolina.
  • This illustrates how incentives create gaming around institutional cut points.
INSIGHT

Local Randomization Near Cutoffs

  • Regression discontinuity (RD) leverages arbitrary cut points to strengthen causal inference by comparing observations just below and just above a threshold.
  • Examples include TA assignment at 44 students and kindergarten age cutoffs where near-cutoff units are treated as locally randomized.
ANECDOTE

Twins Miss Kindergarten Cutoff By 72 Hours

  • Patrick Curran recounts moving to enroll twins after missing his memory of the kindergarten cutoff by 72 hours.
  • The story forced them into extra pre-K because the district required a specific birthdate cutoff.
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