Exploring the Relationships between the Predictors and the Response (cont’d) –Directed graphs can be helpful when examining the relationship between the response and the many flag variables  The directed web graph, shown on the left, is a pictorial image of the relationship between the response (upper right) and (counterclockwise from the response) variables credit card holder, spending months 4 5 and 6, spending months 2 and 3, spending last one month, spending same period last year, returns, response rate, markdown, web buyer, and valid phone number on file  Web graphs are exploratory tools for determining which categorical variables may be of interest for further study  Only the true values for the various flags are indicated