I am not so familiar with 'interpolation' math, albeit I grasp the underlying logic. I was wondering if there is a rule of thumb in the choice of the number of neighbor points to use in IDW interpolation method. This site (http://www.quantdec.com/SYSEN597/GTKAV/section9/chapter_29b.htm) provides a good description of the method, and of the difference between a fixed search radius or a variable one (the latter depending on the specified number of neighbors). But I am still wondering on what basis the number of neighbors has to be chosen. Does it somehow depend on the number of original data points? By the way, I use arcGIS 10.1. w/ advanced license.
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