Using Non-computed Plots in Classification Panels

So far the discussion has focused on how to set up the grid and axes of the panel using simple prototype examples. However, complex prototype plots can also be specified, although BARCHART is the only computed plot that can be used in the prototype. The restriction of using only non-computed plots in the prototype is mitigated by the fact that most computed plot types are available in a non-computed (parameterized) version—BOXPLOTPARM, ELLIPSEPARM, and HISTOGRAMPARM. Also, the fit line statements (REGRESSIONPLOT, LOESSPLOT, or PBSPLINEPLOT) can be emulated with a SERIESPLOT, and the MODELBAND statement can be emulated with a more general BANDPLOT statement, provided the appropriate variables have been created in the input data. Many SAS/STAT and SAS/ETS procedures can create output data sets with this information.

The following example uses PROC GLM to create an output data set that is suitable for showing a panel of scatter plots with overlaid fit lines and confidence bands.

proc template;
define statgraph dosepanel;
 begingraph / designwidth=490px designheight=350px;
   layout datapanel classvars=(dose) / rows=1;
     layout prototype;
       bandplot    x=days limitupper=uclm limitlower=lclm / name="clm"
                     display=(fill)  fillattrs=GraphConfidence
                     legendlabel="95% Confidence Limits";
       bandplot    x=days limitupper=ucl limitlower=lcl / name="cli"
                     display=(outline) outlineattrs=GraphPredictionLimits
                     legendlabel="95% Prediction Limits";	        
       seriesplot  x=days y=predicted / name="reg"
                     lineattrs=graphFit legendlabel="Fit";
       scatterplot x=days y=response /	 primary=true
                     markerattrs=(size=5px) datatransparency=.5;
     endlayout;
     sidebar / align=top;
       entry  "Predicted Response to Dosage (mg) over Time" /
               textattrs=GraphTitleText pad=(bottom=10px);
     endsidebar;
     sidebar / align=bottom;
       discretelegend "reg" "clm" "cli" / across=3;
     endsidebar;
   endlayout;
  endgraph;
 end;
run;

The following procedure code creates the required input data set for the template. It uses a BY statement with the procedure to request the same classification variable that is used in the panel.

data trial;
 do Dose = 100 to 300 by 100;
   do Days=1 to 30;
     do Subject=1 to 10;
       Response=log(days)*(400-dose)* .01*ranuni(1) + 50;
     output;
   end;
  end;
end;
run;

proc glm data=trial alpha=.05 noprint;
 by dose;
 model response=days / p cli clm;
 output out=stats
        lclm=lclm uclm=uclm
        lcl=lcl ucl=ucl
        predicted=predicted;
run; quit;
 
ods listing style=statistical;
proc sgrender data=stats template=dosepanel;
run;

The advantage of using a procedure to generate the data is that the statistical procedures provide many options for controlling the model. A robust model enhances the output data set and therefore benefits the graph.