libname sasdata '\\storage.wpi.edu\academics\courses\MA\SAS-Data\sasdata8';

* This gives the stratified plot;

proc sgplot data=sasdata.laser;
 scatterplot x=operator y=distance;
 xaxis integer;
run;

* And this the sums of squares;

proc glm data=sasdata.laser;
 class operator;
 model distance=operator;
run;
quit;