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

¥ The regression R-squared tells you how well your two variables matched -- a simple cause and effect. R-squared ranges from 0.0 to 1.0, and a value of more than 0.7 is considered a satisfactory correlation.

¥ The X-coefficient tells you how much the dependent variable changes for each unit increase in the independent variable. This number also is used to predict future results when used with the predictor formula and added to the constant.