Example 6 for PROC REG

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/*          S A S   S A M P L E   L I B R A R Y                 */
/*                                                              */
/*    NAME: regex6                                              */
/*   TITLE: Example 6 for PROC REG                              */
/*    DATA: Reaction                                            */
/* PRODUCT: STAT                                                */
/*  SYSTEM: ALL                                                 */
/*    KEYS: Lack-of-fit test                                    */
/*   PROCS: REG                                                 */
/*                                                              */
/* SUPPORT: Robert Cohen                                        */
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data reaction;
   input FeedRate Catalyst AgitRate Temperature
         Concentration ReactionPercentage;
   datalines;
10.0   1.0  100   140  6.0   37.5
10.0   1.0  120   180  3.0   28.5
10.0   2.0  100   180  3.0   40.4
10.0   2.0  120   140  6.0   48.2
15.0   1.0  100   180  6.0   50.7
15.0   1.0  120   140  3.0   28.9
15.0   2.0  100   140  3.0   43.5
15.0   2.0  120   180  6.0   64.5
12.5   1.5  110   160  4.5   39.0
12.5   1.5  110   160  4.5   40.3
12.5   1.5  110   160  4.5   38.7
12.5   1.5  110   160  4.5   39.7
;
proc reg data=reaction;
   model  ReactionPercentage=FeedRate Catalyst AgitRate
                             Temperature Concentration / lackfit;
run;