Moving beyond the classic difference-in-differences model: a simulation study comparing statistical methods for estimating effectiveness of state-level policies

Table 1 Overview of statistical models evaluated in simulation study

Regression specification	Link function	SE estimation	Population weighting
Classic 2-way Fixed Effects	Linear	none; Huber; cluster	Population weighted; unweighted
	Log-linear	none; Huber; cluster	Population weighted; unweighted
	Negative Binomial	none; Huber; cluster	Unweighted, with log(population) used as an offset
	Poisson	none; Huber; cluster	Unweighted, with log(population) used as an offset
Detrended	Linear	none; Huber; cluster	Population weighted; unweighted
	Negative Binomial	none; Huber; cluster	Unweighted, with log(population) used as an offset
Autoregressive	Linear	none; Huber; cluster	Population weighted; unweighted
	Log-linear	none; Huber; cluster	Population weighted; unweighted
	Negative Binomial	none; Huber; cluster	Unweighted, with log(population) used as an offset
	Poisson	none; Huber; cluster	Unweighted, with log(population) used as an offset
GEE	Linear	AR1 structure	Population weighted; unweighted

ISSN: 1471-2288