Cabela's Moves from CHAID to CART (1,105 words)

The data was then built and the cases were split in half. One half became the "learning" or "modeling" sample on which a logistic-regression model was created; the other half was set aside as a "test" or "validation" sample that would test how well the model would stand up to "new" data. First, the model defined about 250 variables (i.e., last date of purchase, total dollars spent, household income). In this pre-processing phase of the modeling, CART was used to examine any abnormalities in the variables.