Workspace Node: Advanced Classification CHAID - Specifications - Quick Tab
The Advanced Classification CHAID workspace node can be accessed from the Feature Finder, the ribbon bar, or the Node Browser. The Specifications - Quick tab is displayed by default when you open the specifications dialog box.
Use previous input description. Select this check box to use the variable selection specified in the Select dependent variables and predictors workspace node, accessed via the ribbon bar or by double-clicking the data source node in the workspace. Note that the previous Select Cases and Weight specifications will be used also. If case selection conditions and/or weights were previously specified, you can view those specifications from this workspace dialog box, but you cannot change them (the options will be dimmed).
| Element Name | Description |
|---|---|
| Variables | Click this button to display a four-variable lists selection dialog box from which you can select the dependent variable, categorical predictor variables, continuous predictors, and count variable (optional).
From the first list, select the dependent variable. If you are analyzing a classification problem with a categorical response variable, the dependent variable must contain text or numeric (integer) codes that identify the class or group to which each case or observation belongs. From the second list, select the categorical variables (factors). Note that these variables must contain text or numeric codes that identify the classes or groups to which each case or observation belongs. From the third list, select the continuous predictors. From the fourth list, select the count variable. This variable is optional. If selected, it will be used as a case-multiplier in the analysis. Thus, by using a count variable you can analyze input data that have previously been aggregated (tabulated). |
| Factor codes | Once you have selected categorical predictor variables, the button for the selection of the factor codes will be available. Click the Factor codes button to display the Select codes for independent variables dialog box, in which you select codes for the Categorical factors. The list of codes can be displayed by clicking the Zoom button. Note that you must select at least two codes for each of the selected Categorical factors. The selected factor codes are treated as case selection conditions, so cases that have an observed factor code that is not included in the selected set will be ignored in the analysis. |
| Response codes | This button is available only after a dependent variable has been specified. The dependent variable is assumed to be categorical in nature, and the object of the analysis is to correctly classify the cases (observations) into groups specified by the dependent variable. Click the Response codes button to display the Select Dependent Code dialog box, in which you make a selection for the Categorical response from the list of codes for the Dependent variable selected in the current analysis. The list of codes can be displayed by clicking the Zoom button. Note that you must select at least two codes for the selected Dependent variable. |
| Options / C / W | See Common Options. |
| OK | Click this button to accept all the specifications made in the dialog box and to close it. The analysis results are placed in the Reporting Documents workspace node after running (updating) the project. |