Resources

Median Chart Example 2

/****************************************************************/
/*          S A S   S A M P L E   L I B R A R Y                 */
/*                                                              */
/*    NAME: SHWMEX2                                             */
/*   TITLE: Median Chart Example 2                              */
/* PRODUCT: QC                                                  */
/*  SYSTEM: ALL                                                 */
/*    KEYS: Shewhart Charts, Median Charts,                     */
/*   PROCS: SHEWHART                                            */
/*    DATA:                                                     */
/*                                                              */
/*     REF: SAS/QC Software:  Usage and Reference, Version 6,   */
/*          First Edition, Volume 1 and Volume 2                */
/*                                                              */
/****************************************************************/

data Wire;
   input Sample Size @;
   do i=1 to Size;
      input Breakstrength @@;
      output;
   end;
   drop i Size;
   label Breakstrength  ='Breaking Strength (lb/in)'
         Sample ='Sample Index';
   datalines;
 1  5 60.6 62.3 62.0 60.4 59.9
 2  5 61.9 62.1 60.6 58.9 65.3
 3  4 57.8 60.5 60.1 57.7
 4  5 56.8 62.5 60.1 62.9 58.9
 5  5 63.0 60.7 57.2 61.0 53.5
 6  7 58.7 60.1 59.7 60.1 59.1 57.3 60.9
 7  5 59.3 61.7 59.1 58.1 60.3
 8  5 61.3 58.5 57.8 61.0 58.6
 9  6 59.5 58.3 57.5 59.4 61.5 59.6
10  5 61.7 60.7 57.2 56.5 61.5
11  3 63.9 61.6 60.9
12  5 58.7 61.4 62.4 57.3 60.5
13  5 56.8 58.5 55.7 63.0 62.7
14  5 62.1 60.6 62.1 58.7 58.3
15  5 59.1 60.4 60.4 59.0 64.1
16  5 59.9 58.8 59.2 63.0 64.9
17  6 58.8 62.4 59.4 57.1 61.2 58.6
18  5 60.3 58.7 60.5 58.6 56.2
19  5 59.2 59.8 59.7 59.3 60.0
20  5 62.3 56.0 57.0 61.8 58.8
21  4 60.5 62.0 61.4 57.7
22  4 59.3 62.4 60.4 60.0
23  5 62.4 61.3 60.5 57.7 60.2
24  5 61.2 55.5 60.2 60.4 62.4
25  5 59.0 66.1 57.7 58.5 58.9
;



title 'Median Chart for Breaking Strengths';
ods graphics on;
proc shewhart data=Wire;
   mchart Breakstrength*Sample / odstitle=title;
run;

title 'Estimates of the Process Standard Deviation';
proc shewhart data=Wire;
   mchart Breakstrength*Sample / outlimits=Wirelim1
                         nochart outindex ='NOWEIGHT-Ranges';
   mchart Breakstrength*Sample / outlimits=Wirelim2
                         stddeviations
                         nochart outindex ='NOWEIGHT-Stds';
   mchart Breakstrength*Sample / outlimits=Wirelim3
                         smethod  =mvlue
                         nochart outindex ='MVLUE   -Ranges';
   mchart Breakstrength*Sample / outlimits=Wirelim4
                         stddeviations
                         smethod  =mvlue
                         nochart outindex ='MVLUE   -Stds';
   mchart Breakstrength*Sample / outlimits=Wirelim5
                         stddeviations
                         smethod  =rmsdf
                         nochart outindex ='RMSDF   -Stds';
run;

data Wlimits;
   set Wirelim1 Wirelim2 Wirelim3 Wirelim4 Wirelim5;
   keep _index_ _stddev_;
run;

title 'The Wlimits Data Set';
proc print data=Wlimits noobs;
run;