Instrumental variables I & II

Paul J. Gertler et al., Impact Evaluation in Practice, 2nd ed. (Inter-American Development Bank; World Bank, 2016), https://openknowledge.worldbank.org/handle/10986/25030.↩︎

Joshua D. Angrist and Jörn-Steffen Pischke, Mastering ’Metrics: The Path from Cause to Effect (Princeton, NJ: Princeton University Press, 2015).↩︎

Scott Cunningham, Causal Inference: The Mixtape, 2018, https://www.scunning.com/mixtape.html.↩︎