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c Chart for Varying Number of Inspection Units

/****************************************************************/
/*          S A S   S A M P L E   L I B R A R Y                 */
/*                                                              */
/*    NAME: SHWCEX3                                             */
/*   TITLE: c Chart for Varying Number of Inspection Units      */
/* PRODUCT: QC                                                  */
/*  SYSTEM: ALL                                                 */
/*    KEYS: Shewhart Charts, c Charts,                          */
/*   PROCS: SHEWHART                                            */
/*    DATA:                                                     */
/*                                                              */
/*     REF: SAS/QC Software:  Usage and Reference, Version 6,   */
/*          First Edition, Volume 1 and Volume 2                */
/*                                                              */
/****************************************************************/

data Trucks4;
   input Day Defects Ntrucks @@;
   label Day='Day'
         Defects='Number of Paint Defects';
   datalines;
 1   5  1    2   9  3
 3   5  2    4   9  2
 5  24  4    6  10  2
 7  15  3    8  17  3
 9  16  3   10  13  2
11  28  4   12  18  5
13   8  2   14   7  2
15   5  1   16  17  3
17   2  1   18  17  3
19  15  4   20  19  5
21   6  3   22  23  5
23  27  4   24   6  2
25  12  2   26  12  3
;

ods graphics on;
title 'c Chart for Varying Number of Units Per Subgroup';
proc shewhart data=Trucks4;
   cchart Defects*Day / subgroupn = Ntrucks
                        odstitle  = title
                        nolegend;
run;