General CHAID Analysis Wizard--Extended Options - Classification Tab

Select the Classification tab of the GCHAID Analysis Wizard Extended Options dialog box to access the options described here.

Element Name Description
Misclassification costs Use these options to assign greater importance to the accurate prediction (classification)  for some classes as compared to others. For example, in medical research you may want assign greater importance to the accurate classification of malignant tumors as compared to accurate discrimination between different types of benign forms. In that case, you would assign greater costs to the misclassification of malignant tumors, and lower costs to the misclassification of benign tumors. Note also that, as illustrated in this example, the matrix of misclassification costs does not necessarily have to be symmetric, and in fact it rarely is (i.e., it is more costly to misclassify malignant tumors as benign, then the other way around).
Equal If you select the Equal option button, each off-diagonal element of the predicted class (row) by observed class (column) misclassification costs matrix is set equal to 1.0.
User spec Select the User spec. (User specified) option button to display the User-Specified Misclassification Costs dialog box if more accurate classification is desired for some classes than others. Note that this option is available only if you have selected the Categorical response check box and have selected the codes by clicking the Response codes button on the Quick tab.