How to do CHAID Analysis Using SPSS?
SPSS CHAID gives you different options for the method of merging categories, setting the number of branch levels and choosing the types of significance tests used. We can change the default “depth limit,” or the maximum number of branch levels used from three to five to maximize the number of significant segments found. It turns out there is nothing significant beyond five levels. After completing this dialog box, SPSS CHAID brings up two windows: a global window and a local window. The global window displays the entire tree (though we have not yet built our tree) and highlights the currently selected node. The selected node is also highlighted in the local window, which only shows the current node and one level of branches emanating from it. Next we tell SPSS CHAID to find patterns. We can either have SPSS CHAID find significant segments automatically, or we can choose to build branches manually. The latter is useful for checking if statistically significant breaks are also commercial
