Circulation: Use Regression Analysis to Optimize Catalog Circ and Sales Data

To discern how purchases fluctuate with discounts, the amounts of the actual discounts in both areas will vary, and this becomes the independent variable. We’ll offer discounts from 5 percent to 10 percent in monthly catalog mailings inserted as discount coupons for a year. The dependent variable is the percent increase in sales, as this variable is entirely dependent on the discount offered (or it should be; if it’s not, then something else is affecting sales).