Shewhart test=

Quentin — Wed, 08 May 2013 18:10:09 GMT

Hi,

I'm using PROC SHEWHART to make a chart with tests=3 to detect runs of 6 increasing / decreasing values.

In below example (modified from docs), I create a run of 8 increasing values. But only the first 6 values are highlighted in red. And in the output dataset, only the 6th value is flagged by the _Tests_ variable.

Is there any way to make all values in a run (8 in this case) be highlighted, and make the _Tests_ variable indicate rule 3 was violated for all 8 records? (Other than of course counting myself)

Sample code and listing below, graph attached.

Thanx,

-Q.

data Assembly;
length System $ 1 comment $ 16;
label Sample = 'Sample Number';
input System Sample OffsetX OffsetR OffsetN comment $16. ;
if sample=19 then offsetX=21.5; *makes a run of 8;
datalines;
T 1 19.80 3.8 5
T 2 17.16 8.3 5
T 3 20.11 6.7 5
T 4 20.89 5.5 5
T 5 20.83 2.3 5
T 6 18.87 2.6 5
T 7 20.84 2.3 5
T 8 23.33 5.7 5 New Tool
T 9 19.21 3.5 5
T 10 20.48 3.2 5
T 11 22.05 4.7 5
T 12 20.02 6.7 5
T 13 17.58 2.0 5
T 14 19.11 5.7 5
T 15 20.03 4.1 5
R 16 20.56 3.7 5 Changed System
R 17 20.86 3.3 5
R 18 21.10 5.6 5 Reset Tool
R 19 19.05 2.7 5
R 20 21.76 2.8 5
R 21 21.76 6.4 5
R 22 20.54 4.8 5
R 23 20.04 8.2 5
R 24 19.94 8.8 5
R 25 20.70 5.1 5
Q 26 21.40 12.1 7 Bad Reading
Q 27 21.32 3.2 7
Q 28 20.03 5.2 7 New Gauge
Q 29 22.02 5.9 7
Q 30 21.32 4.3 7
;


ods graphics off;
title 'Analysis of Assembly Data';
proc shewhart history=Assembly2;
xrchart Offset * Sample / 
  outtable=ShewResults
  mu0 = 20
  sigma0 = 2.24
  limitn = 5
  alln
  tests = 3
  vaxis = 16 to 26 by 2
  split = '/';
  label OffsetX = 'Avg Offset in cm/Range'
;
run;

proc print data=shewresults;
  var sample _subx_ _tests_;
run;

***listing:
Sample    _SUBX_    _TESTS_

   1       19.80
   2       17.16
   3       20.11
   4       20.89
   5       20.83
   6       18.87
   7       20.84
   8       23.33
   9       19.21
  10       20.48
  11       22.05
  12       20.02
  13       17.58
  14       19.11
  15       20.03
  16       20.56
  17       20.86
  18       21.10       3
  19       21.50
  20       21.76
  21       21.76
  22       20.54
  23       20.04
  24       19.94
  25       20.70
  26       21.40
  27       21.32
  28       20.03
  29       22.02
  30       21.32

topic Shewhart test= in Statistical Procedures

Shewhart test=