Last updated on 07/24/2014
Glynn A, Wakefield J, Handcock M, Richardson T. Alleviating Linear Ecological Bias and Optimal Design with Subsample Data. Journal of the Royal Statistical Society: Series A. 2008;171 (1) :179-202.
Front-door Difference-in-Differences Estimators
Front-door Versus Back-door Adjustment with Unmeasured Confounding: Bias Formulas for Front-door and Hybrid Adjustments