Legends

Many plot statements support a GROUP= option that partitions the data into unique values, performs separate analysis, if necessary, and automatically assigns distinct visual properties to each group value. The visual properties of group values are defined by the style in effect.

Legends are not automatically displayed for plots with group values. Rather, an appropriate legend statement must be added to the template to generate the desired legend. In the following example, a legend is added to display markers and line patterns that show the association between the group values from a scatter plot and corresponding linear regression lines. The example shows the mechanism that GTL uses to associate a legend with its corresponding plot(s): a name is assigned to each plot that must be represented in the legend, and these names are then used as arguments for the legend statement (in this case, DISCRETELEGEND).

proc template;
 define statgraph scatterfit;
  begingraph;
  entrytitle "Linear Regression By Gender";  
   layout overlay; 
     scatterplot x=height y=weight / group=sex name="scat";
     regressionplot x=height y=weight/ group=sex name="reg";
     discretelegend "scat" "reg" / border=true;
   endlayout;
  endgraph;
 end;
run;

For more information about managing legends in GTL, see SAS/GRAPH: Graph Template Language User's Guide.