u Charts-Varying Number of Inspection Units
/****************************************************************/
/* S A S S A M P L E L I B R A R Y */
/* */
/* NAME: SHWUEX3 */
/* TITLE: u Charts-Varying Number of Inspection Units */
/* PRODUCT: QC */
/* SYSTEM: ALL */
/* KEYS: Shewhart Charts, u Charts, */
/* PROCS: SHEWHART */
/* DATA: */
/* */
/* REF: SAS/QC Software: Usage and Reference, Version 6, */
/* First Edition, Volume 1 and Volume 2 */
/* */
/****************************************************************/
data Fabrics2;
input Roll Defects Squaremeters @@;
datalines;
1 7 30.0 2 11 27.6 3 15 30.4 4 6 34.8 5 11 26.0
6 15 28.6 7 5 28.0 8 10 30.2 9 8 28.2 10 3 31.4
11 3 30.3 12 14 27.8 13 3 27.0 14 9 30.0 15 7 32.1
16 6 34.8 17 7 26.5 18 5 30.0 19 14 31.3 20 13 31.6
21 11 29.4 22 6 28.6 23 6 27.5 24 9 32.6 25 11 31.7
;
title 'Number of Fabric Defects';
proc print data=Fabrics2(obs=5) noobs;
run;
ods graphics on;
title 'u Chart for Fabric Defects per Square Meter';
proc shewhart data=Fabrics2;
uchart Defects*Roll / subgroupn = Squaremeters
outlimits = Fablimits
odstitle = title
markers;
run;
title 'Control Limits for Fabric Defects';
proc print data=Fablimits noobs;
run;
ods graphics off;
symbol1 c=blue v=circle;
symbol2 c=vig;
symbol3 c=salmon;
title 'u Chart for Fabric Defects per Square Meter';
proc shewhart data=Fabrics2;
uchart Defects*Roll / subgroupn = Squaremeters
outlimits = Fablimits2
limitn = 30
alln
nmarkers;
run;
title 'Fixed Control Limits for Fabric Defects';
proc print data=Fablimits2 noobs;
run;