/* regdemo.sas              simple regression problem */
  options ls=80 ;
  data a ;
   input y @@ ;       * read across ;
   x = _n_ ;          * so x goes 1 to 6 ;
   xx = x * x ;       * quadratic ;
  cards ;
   4.5  5.5  6.5  8  10  12
  ;
 run ;
  proc reg data=a ;
   one: model y = x ;      * simple linear regression ;
   two: model y = x xx ;   * quadratic regression ;
   output out=b p=yhat r=ehat ;
 run ;
  proc print data=b ;
    title 'regression results' ;
 run ;