Support and Services at Home (SASH) Evaluation: First Annual Report. Notes


  1. Total Medicare expenditures excludes the fees paid by the Medicare program to the SASH program for services.

  2. See Cameron and Trivedi (2005) for an extensive discussion of this model. The average outcome, conditional on the covariates, in the negative binomial model is exp(linear index), where exp(.) is the exponential function and the "linear index" is the right-hand side of Equation B.1.

  3. Puhani, P.A. (2012). "The treatment effect, the cross difference, and the interaction term in non-linear 'difference-in-differences' models." Economics Letters, 115, pp.85-87. Note that the demonstration effects in equation 1.2 depend on Xij, the vector of beneficiary-level and practice-level characteristics.

  4. Since αt must be a fixed constant, t was chosen to represent the start of the SASH demonstration.

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