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Adding Curves to Graphs

Call a Procedure to Create Data for a Curve

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 ); 
   proc reg data=Hurr; 
      model wind_kts = min_pressure; 
      output out=RegOut P=Pred R=Residual LCL=LCL UCL=UCL; 
   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:

  • whether the curve will be drawn on top of observations or under them

  • the coordinate system in which the curve will be drawn

  • the color, line style, and line width of the curve

  • the coordinates of the curve

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

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