Extended Data Fig. 1: Illustration of the difference-in-difference (DID) estimation of treatment effects for yield and planting date outcomes for each crop.
From: The mixed effects of recent cover crop adoption on US cropland productivity
Dashed lines indicate the expected change in outcomes for the treatment group between the pre-treatment period (2000-2009) and post-treatment period (2016-2022) under a parallel trends assumption. The value of d represents the inferred effect of cover crop on each outcome, before adjusting for measurement error in cover crop estimates.
