organ_donation data contains data from Kessler and Roth (2014) on organ donation rates by state and quarter. The state of California enacted an active-choice phrasing for their organ donation sign-up questoin in Q32011. The only states included in the data are California and those that can serve as valid controls; see Kessler and Roth (2014).
A data frame with 162 rows and 3 variables
The state, where California is the Treated group
Quarter of observation, in "Q"QYYYY format
Organ donation rate
Quarter of observation in numerical format. 1 = Quarter 4, 2010
This data is used in the Difference-in-Differences chapter of The Effect.
Kessler, J.B. and Roth, A.E., 2014. Don't take 'no' for an answer: An experiment with actual organ donor registrations. National Bureau of Economic Research working paper No. 20378. https://www.nber.org/papers/w20378
Huntington-Klein. 2021. The Effect: An Introduction to Research Design and Causality. https://theeffectbook.net.