Kriging With Nonparametric Variance Function Estimation
Jean D. Opsomer, D. Ruppert, M. P. Wand, U. Holst, O. Hussjer
February 1998 [98-WP 188]
Opsomer, J.D., D. Ruppert, M. Wand, U. Holst, and O. Hussjer. 1998. "Kriging With Nonparametric Variance Function Estimation." Working paper 98-WP 188. Center for Agricultural and Rural Development, Iowa State University.
The authors propose a method for fitting regression models to data that exhibit spatial correlation and heteroskedasticity. A combination of parametric and nonparametric regression techniques is used to iteratively estimate the various components of the model. The approach is demonstrated on a large dataset of predicted nitrogen runoff statistics from agricultural land in the Midwest and Northern Plains.