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Getting Started Example 1 for PROC ROBUSTREG

/****************************************************************/
/*          S A S   S A M P L E   L I B R A R Y                 */
/*                                                              */
/*    NAME: rreggs1                                             */
/*   TITLE: Getting Started Example 1 for PROC ROBUSTREG        */
/* PRODUCT: STAT                                                */
/*  SYSTEM: ALL                                                 */
/*    KEYS: Robust Regression                                   */
/*                                                              */
/*   PROCS: ROBUSTREG                                           */
/*    DATA:                                                     */
/*                                                              */
/* SUPPORT: Yonggang Yao                                        */
/*     REF:                                                     */
/*    MISC:                                                     */
/****************************************************************/

data Stack;
   input  x1 x2 x3 y exp $ @@;
   datalines;
80  27   89  42   e1   80  27   88  37   e2
75  25   90  37   e3   62  24   87  28   e4
62  22   87  18   e5   62  23   87  18   e6
62  24   93  19   e7   62  24   93  20   e8
58  23   87  15   e9   58  18   80  14  e10
58  18   89  14  e11   58  17   88  13  e12
58  18   82  11  e13   58  19   93  12  e14
50  18   89   8  e15   50  18   86   7  e16
50  19   72   8  e17   50  19   79   8  e18
50  20   80   9  e19   56  20   82  15  e20
70  20   91  15  e21
;

proc robustreg data=stack;
   model y = x1 x2 x3 / diagnostics leverage;
   id    exp;
   test  x3;
run;

ods graphics on;

proc robustreg data=stack plots=(rdplot ddplot histogram qqplot);
   model y = x1 x2 x3;
run;

ods graphics off;

proc robustreg method=m(wf=bisquare(c=3.5)) data=stack;
   model y = x1 x2 x3 / diagnostics leverage;
   id    exp;
   test  x3;
run;