In this recipe we will identify and select variables to include as model inputs using the CHAID node.
You will need a copy of Microsoft Excel to visualize and select the chi-square values for each variable.
This recipe uses the datafile cup98lrn_reduced_vars3.sav
and the stream recipe_variableselection_chaid.str
.
To identify and select variables to include as model inputs using the CHAID node:
Open the stream
variableselection_chaid.str
by navigating to File | Open Stream and selecting the stream.Make sure the datafile points to the correct path for the file
cup98lrn_reduced_vars3.sav
.Open the Type node named
CHAID Types
. Notice that there are several variables of type continuous whose direction values have been set to Input, and a single continuous variable has its direction set to Target. The variable set to Target should be the target variable TARGET_B.Open the node TARGET_B and select the Interactive Model option...