Danilevsky Iteration */

Divide wxHORIZONTALly or wxVERTICALly

Return true if anything changed

* mean_centers == true: save mean centers * mean_centers == false: save centroids */

Only wxGrid should call this, others should use Selected(int row) */

Returns group names, not underlying DB name (unless a simple group). If -1 or out of range, then empty string returned. */

Likelihood Ratio Test for spatial lag/error dependence

loess_struct* GetLoess() { return &lo; }