Optimize Model?

[JasonLaura]

In the ArcGIS Geostatistical Wizard, what exactly is the optimize model button doing on the covariance / semivariogram page?  I see that is is changing bin size, number of lags, and sill distance.  What exactly is occurring?  Why is it possible to optimize the model multiple times?

Thanks!

[EricKrause]

The optimize button finds the parameters that result in the lowest root-mean-square error (RMS).  In kriging, for a given semivariogram type that you choose (Stable, Exponential, etc), it will optimize the range, nugget, and partial sill to find the lowest RMS.  If anisotropy is turned on, it will also find the optimal direction and major/minor semiaxes.

[EricKrause]

Also keep in mind that the optimization is done after you do any transformations, trend removal, or declustering.  Optimizing the model won't correct any mistakes that you may have made during those previous steps.