Getting Started Example 1 for PROC NESTED

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/*          S A S   S A M P L E   L I B R A R Y                 */
/*                                                              */
/*    NAME: NESTGS1                                             */
/*   TITLE: Getting Started Example 1 for PROC NESTED           */
/*          Reliability of Automobile Models                    */
/* PRODUCT: STAT                                                */
/*  SYSTEM: ALL                                                 */
/*    KEYS: Reliability of several models                       */
/*   PROCS: NESTED                                              */
/*    DATA:                                                     */
/*                                                              */
/* SUPPORT: Tianlin Wang                                        */
/*     REF:                                                     */
/*    MISC:                                                     */
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title1 'Reliability of Automobile Models';
data auto;
   input Make $ Model Score @@;
   datalines;
a 1 62  a 2 77  a 3 59
a 1 67  a 2 73  a 3 64
a 1 60  a 2 79  a 3 60
b 1 72  b 2 58  b 3 80
b 1 75  b 2 63  b 3 84
b 1 69  b 2 57  b 3 89
c 1 94  c 2 76  c 3 81
c 1 90  c 2 75  c 3 85
c 1 88  c 2 78  c 3 85
d 1 69  d 2 73  d 3 90
d 1 72  d 2 88  d 3 87
d 1 76  d 2 87  d 3 92
;
proc sort data=auto;
   by Make Model;
run;

title1 'Reliability of Automobile Models';
proc nested data=auto;
   class Make Model;
   var Score;
run;