Resources

Median Chart Examples

/****************************************************************/
/*          S A S   S A M P L E   L I B R A R Y                 */
/*                                                              */
/*    NAME: SHWMCHR                                             */
/*   TITLE: Median Chart Examples                               */
/* 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 Detergent;
   input Lot @;
   do i=1 to 5;
      input Weight @;
      output;
   end;
   drop i;
   datalines;
 1 17.39 26.93 19.34 22.56 24.49
 2 23.63 23.57 23.54 20.56 22.17
 3 24.35 24.58 23.79 26.20 21.55
 4 25.52 28.02 28.44 25.07 23.39
 5 23.25 21.76 29.80 23.09 23.70
 6 23.01 22.67 24.70 20.02 26.35
 7 23.86 24.19 24.61 26.05 24.18
 8 26.00 26.82 28.03 26.27 25.85
 9 21.58 22.31 25.03 20.86 26.94
10 22.64 21.05 22.66 29.26 25.02
11 26.38 27.50 23.91 26.80 22.53
12 23.01 23.71 25.26 20.21 22.38
13 23.15 23.53 22.98 21.62 26.99
14 26.83 23.14 24.73 24.57 28.09
15 26.15 26.13 20.57 25.86 24.70
16 25.81 23.22 23.99 23.91 27.57
17 25.53 22.87 25.22 24.30 20.29
18 24.88 24.15 25.29 29.02 24.46
19 22.32 25.96 29.54 25.92 23.44
20 25.63 26.83 20.95 24.80 27.25
21 21.68 21.11 26.07 25.17 27.63
22 26.72 27.05 24.90 30.08 25.22
23 31.58 22.41 23.67 23.47 24.90
24 28.06 23.44 24.92 24.64 27.42
25 21.10 22.34 24.96 26.50 24.51
26 23.80 24.03 24.75 24.82 27.21
27 25.10 26.09 27.21 24.28 22.45
28 25.53 22.79 26.26 25.85 25.64
;


title 'The Data Set DETERGENT';
proc print data=Detergent(obs=16) noobs;
run;

ods graphics off;
title 'Median Chart for Detergent Box Weight';
proc shewhart data=Detergent;
   mchart Weight*Lot;
run;

data Detsum;
   input Lot WeightM WeightR;
   WeightN = 5;
   datalines;
 1  22.56  9.54
 2  23.54  3.07
 3  24.35  4.65
 4  25.52  5.05
 5  23.25  8.04
 6  23.01  6.33
 7  24.19  2.19
 8  26.27  2.18
 9  22.31  6.08
10  22.66  8.21
11  26.38  4.97
12  23.01  5.05
13  23.15  5.37
14  24.73  4.95
15  25.86  5.58
16  23.99  4.35
17  24.30  5.24
18  24.88  4.87
19  25.92  7.22
20  25.63  6.30
21  25.17  6.52
22  26.72  5.18
23  23.67  9.17
24  24.92  4.62
25  24.51  5.40
26  24.75  3.41
27  25.10  4.76
28  25.64  3.47
;



title 'Summary Data Set for Detergent Box Weights';
proc print data=Detsum noobs;
run;

options nogstyle;
goptions ftext=swiss;
title 'Median Chart for Weights';
proc shewhart history=Detsum;
   mchart Weight*Lot / cframe  = viv
                       cinfill = vpav
                       cconnect = yellow;
run;
options gstyle;

proc shewhart data=Detergent;
   mchart Weight*Lot / outhistory = Dethist
                       nochart;
run;

title 'Summary Data Set DETHIST for Detergent Box Weights';
proc print data=Dethist noobs;
run;

proc shewhart data=Detergent;
   mchart Weight*Lot / outhistory = Dethist2
                       stddeviations
                       nochart;
run;

title 'Summary Data Set with Subgroup Standard Deviations';
proc print data=Dethist2 noobs;
run;

proc shewhart data=Detergent;
   mchart Weight*Lot / outlimits=Detlim
                       nochart;
run;

title 'Control Limits for Detergent Box Weights';
proc print data=Detlim noobs;
run;

proc shewhart data=Detergent;
   mchart Weight*Lot / outtable=Dtable
                       nochart;
run;

title 'Summary Statistics and Control Limit Information';
proc print data=Dtable noobs;
run;

data Detergent2;
   input Lot @;
   do i=1 to 5;
      input Weight @;
      output;
   end;
   drop i;
   datalines;
29 16.66 27.49 18.87 22.53 24.72
30 23.74 23.67 23.64 20.26 22.09
31 24.56 24.82 23.92 26.67 21.38
32 25.89 28.73 29.21 25.38 23.47
33 23.32 21.61 30.75 23.13 23.82
34 23.04 22.65 24.96 19.64 26.84
35 24.01 24.38 24.86 26.50 24.37
36 26.43 27.36 28.74 26.74 26.27
37 21.41 22.24 25.34 20.59 27.51
38 22.62 20.81 22.64 30.15 25.32
39 26.86 28.14 24.06 27.35 22.49
40 23.03 23.83 25.59 19.85 22.33
41 23.19 23.63 23.00 21.46 27.57
42 27.38 23.18 24.99 24.81 28.82
43 26.60 26.58 20.26 26.27 24.96
44 26.22 23.28 24.15 24.06 28.23
45 25.90 22.88 25.55 24.50 19.95
46 16.66 27.49 18.87 22.53 24.72
47 23.74 23.67 23.64 20.26 22.09
48 24.56 24.82 23.92 26.67 21.38
49 25.89 28.73 29.21 25.38 23.47
50 23.32 21.61 30.75 23.13 23.82
;

ods graphics on;
title 'Median Chart for Weights';
proc shewhart data=Detergent2 limits=Detlim;
   mchart Weight*Lot / odstitle=title markers;
run;