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imaged should be estimated. One can avoid estimation at certain points or regions by making use of selection variables. 2.5 Research procedure To achieve the goal of finding an optimal configuration for Factorial Kriging, we will execute a parameter sweep, varying both the search window dimensions and the minimum distance. First we must define a regular grid which allows us to plot an image of the estimated variable. A satisfactory configuration will be achieved when the estimated image stabilizes thus if changing the parameter does not change the image qualitatively. This can also be evaluated by making a scatterplot of subsequent estimations and seeing if the points are located on the first bisection line, which indicates a perfect one-on-one match. 17
