/*   MPG.SAS   */
OPTIONS PS=58  NODATE  pageno=1;
DATA MILEAGE;
*********************************************************************
*                                                                   *
* A CAR IS TESTED FOR GAS MILEAGE AT VARIOUS SPEEDS TO DETERMINE    *
* AT WHAT SPEED THE CAR ACHIVES THE GREATEST GAS MILEAGE. A         *
* QUADRATIC RESPONSE SURFACE IS FIT TO THE EXPERIMENTAL DATA.       *
*                                                                   *
********************************************************************;
   INPUT SPEED MPG;
   LIST;
   CARDS;
 20 15.4
 30 20.2
 40 25.7
 50 26.6
 50 26.2
 50 27.4
 55 .
 60 24.8
 ;
PROC GLM;
   MODEL MPG=SPEED SPEED*SPEED / P ;
   OUTPUT OUT=M PREDICTED=MPGHAT  RESIDUAL=R;
   QUIT;
PROC PLOT;
   PLOT MPG*SPEED='O'  MPGHAT*SPEED='P' / OVERLAY;
   QUIT;