Adding Curves to Graphs

In Chapter 5: Adding Variables to the DataObject, you created a residual plot. In this chapter you also create a scatter plot of the independent and dependent variables that shows the model’s predicted values and the upper and lower 95% limits for individual predictions. The REG procedure outputs the predicted values with the P= option in the MODEL statement, and the upper and lower prediction limits with the LCL= and UCL= options.

Type or copy the following statements into a program window, and select Program →Run from the main menu.

 
   declare DataObject dobj; 
   dobj = DataObject.CreateFromFile("Hurricanes"); 
    
   dobj.WriteVarsToServerDataSet( {"wind_kts" "min_pressure"}, 
      "Work", "Hurr", true ); 
    
   submit; 
   proc reg data=Hurr plots=none; 
      model wind_kts = min_pressure; 
      output out=RegOut P=Pred R=Residual LCL=LCL UCL=UCL; 
   run; 
   endsubmit; 
    
   ok = CopyServerDataToDataObject( "Work", "RegOut", dobj,  
      {"Pred" "Residual" "LCL" "UCL"}, /* names on server */ 
      {"Pred" "Residual" "LCL" "UCL"}, /* names in DataObject */ 
      {"Predicted" "Residuals" "Lower Conf. Limit" "Upper Conf. Limit"},  
      true ); 

The first two sets of statements are explained in Chapter 2: Reading and Writing Data. The next two sets of statements are similar to statements in the example from Chapter 5: Adding Variables to the DataObject.

Whenever you want to add a line or curve to a plot, you need to specify the following:

These aspects are discussed in the SAS/IML Studio online Help.