Cokriging—a computer program

Abstract Cokriging is a process wherein several variables can be jointly estimated on the basis of intervariable and spatial structure information. Presented herein is the program COKRIG, for punctual cokriging, a program in a simple form to demonstrate the utility of cokriging. Equation solution follows a modification of a method developed for the solution of large-scale linear systems. Several example problems show that, at least for earthquake data, the inclusion of intervariable information results in a more accurate BLUE (best linear unbiased estimator).