Scatter diagram with regression line 

Regression line and 95% confidence interval 

Regression line and 95% prediction interval 

Regression line, 95% confidence interval and 

95% prediction interval 

When you click a point on the regression line, the program will give the x value and the f(x) value 

calculated using the regression equation. 

You can press Ctrl+P to print the scatter diagram, or function key F10 to save the picture as file on disk.  

To define other titles or colors in the graph, or change the axis scaling, see p. 11. 

If you want to repeat the scatter diagram, possibly to select a different regression equation, then you only 

have to press function key F7.  The dialog box will re appear with the previous entries (see p. 14). 

Residuals plot 

When you select the option Residuals plot in the Regression line dialog box, the program will display a 

second window with the residuals plot.  Residuals are the differences between the predicted values and 

the observed values for the dependent variable.  The residual plot allows for the visual evaluation of the 

goodness of fit of the selected model or equation.  Residuals may point to possible outliers (unusual 

values) in the data or problems with the regression model.  If the residuals display a certain pattern, you 

should consider selecting a different regression model. 

59