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Changing the Support of a Spatial Covariate: A Simulation Study

^a Dep. of Statistics, Univ. of Nebraska–Lincoln, Lincoln, NE 68583-0963
^b USDA-ARS, NPA Grains, Bioenergy, and Forage Research, Univ. of Nebraska–Lincoln, Lincoln, NE 68583-0897
^c Dep. of Agronomy and Horticulture, Univ. of Nebraska–Lincoln, Lincoln, NE 68583-0915

View larger version (9K): [in this window] [in a new window]   Figure 1. Example of a spherical semivariogram.

View larger version (37K): [in this window] [in a new window]   Figure 2. Layout for data generation.

View larger version (21K): [in this window] [in a new window]   Figure 3. Illustration of the covariate selection. (a) The covariate is obtained from the central point of the plot. (b) The covariate is obtained by averaging the observations in the central 3 x 3 square of the plot. (c) The covariate is obtained by averaging all 25 observations in the plot.