options formdlim = '-' nodate;

data food2;
  infile 'food2.txt';
  input trt sex $ type $ pref;

/* compute the means for each combination of sex and type */
proc sort;
  by sex type;
       
proc means noprint;
  by sex type;
  var pref;
  output out = means mean = meanpref;
run;
       
proc plot;
  plot meanpref*type = sex; /* plot with type on the X axis */
  plot meanpref*sex = type; /* plot with sex on the X axis */
  plot meanpref*type = '*' $ sex;  /* put labels to the side of the point */
run;
     
/* Hi-res plots, commented out, so not run:
proc gplot;
  plot meanpref*type = sex; /* plot with type on the X axis */
  plot meanpref*sex = type; /* plot with sex on the X axis */
run;

The $ syntax only works in proc plot.  The = syntax works in both.
*/