Milling yield and quality system estimates.

a, Marginal effects of TDN on chalk content (CHK) formation; this effect is interpreted as the percentage point change in CHK due to a one-unit change in TDN. b, Marginal effects of TDN, CHK, and harvest moisture content (HMC) on HRY. c, Marginal effects of TDN and HMC on MRY. *,**, and *** represent statistical significance at the 0.10, 0.05, and 0.01 levels, respectively. Station fixed-effect estimates have been omitted from this table. We estimated the system using Generalized Method of Moments (GMM) estimation to account for heteroskedasticity of unknown forms, including spatial correlation of the error terms. Adjusted R2 values, while not identical in calculation to OLS R2 values, serve as a goodness-of-fit measure.