data quartet;
  * From Fox, Applied Regression Analysis. ;
  * Four Regression Datasets ;
  * Source: F. J. Anscombe (1973), "Graphs in statistical analysis," ;
  * American Statistician, 27: 17-21. ;
  input x1 y1 y2 y3 x4 y4 ;
  x2=x1 ;
  x3=x1 ;
  * x1  "x value for dataset 1" ;
  * x2  "x value for dataset 2" ;
  * x3  "x value for dataset 3" ;
  * x4  "x value for dataset 4" ;
  * y1  "y value for dataset 1" ;
  * y2  "y value for dataset 2" ;
  * y3  "y value for dataset 3" ;
  * y4  "y value for dataset 4" ;
cards;
10  8.04  9.14  7.46    8  6.58
 8  6.95  8.14  6.77    8  5.76
13  7.58  8.74 12.74    8  7.71
 9  8.81  8.77  7.11    8  8.84
11  8.33  9.26  7.81    8  8.47
14  9.96  8.10  8.84    8  7.04
 6  7.24  6.13  6.08    8  5.25
 4  4.26  3.10  5.39   19 12.50
12 10.84  9.13  8.15    8  5.56
 7  4.82  7.26  6.42    8  7.91
 5  5.68  4.74  5.73    8  6.89
;
run;

proc means;
run;