Thomas (Tom) Leavitt

Methods guides

• Difference-in-Differences website (with Bret Zeldow and Laura Hatfield). Health Policy Data Science (HPDS) Lab, Harvard University and Stanford University.

  • [Difference-in-Differences]

• Essential proofs for design-based, causal inference, which (for pedagogical reasons) include greater detail than other sources

  • [Unbiasedness of Difference-in-Means estimator]

  • [Derivation of Difference-in-Means estimator’s variance]

  • [Conservative Estimation of Difference-in-Means estimator’s variance]