Nature research paper: Global trends of cropland phosphorus use and sustainability challenges
Cointegrating Polynomial Regressions: Fully Modified Ols Estimation and InferenceWe thank the OCP Research LLC for providing financial support and suggestions; F. Knorre for providing the code for the cointegration test, the non-cointegration test and the extended fully modified ordinary least squares estimator adapted for the cointegrating polynomial regression; D.
Liang and V. Lyubchich for providing suggestions on statistical analyses; A. J. Elmore and K. Jackson for providing suggestions on map copyright; and K. Jackson for generating the main-text maps in ArcGIS. X.Z. is supported by the National Science Foundation and the Belmont Forum.Appalachian Laboratory, University of Maryland Center for Environmental Science, Frostburg, MD, USA
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