p Charts with Unequal Subgroup Sample Sizes
/****************************************************************/
/* S A S S A M P L E L I B R A R Y */
/* */
/* NAME: SHWPEX3 */
/* TITLE: p Charts with Unequal Subgroup Sample Sizes */
/* PRODUCT: QC */
/* SYSTEM: ALL */
/* KEYS: Shewhart Charts, p Charts, */
/* PROCS: SHEWHART */
/* DATA: */
/* */
/* REF: SAS/QC Software: Usage and Reference, Version 6, */
/* First Edition, Volume 1 and Volume 2 */
/* */
/****************************************************************/
data Battery;
length lot $3;
input lot nFailed Sampsize @@;
label nFailed = 'Number Failed'
lot = 'Lot Number'
Sampsize = 'Number Sampled';
datalines;
AE3 6 151 AE4 5 142 AE9 6 145
BR3 9 149 BR7 3 150 BR8 0 156
BR9 4 150 DB1 9 158 DB2 4 152
DB3 0 162 DB5 9 140 DB6 7 161
DS4 6 154 DS6 1 144 DS8 5 154
JG1 3 151 MC3 8 148 MC4 2 143
MK6 4 150 MM1 4 147 MM2 0 150
RT5 2 154 RT9 8 149 SP1 3 160
SP3 9 153
;
ods graphics off;
title 'Proportion of Battery Failures';
proc shewhart data=Battery;
pchart nFailed*Lot / subgroupn = Sampsize
turnhlabels
font = 'Lucida Console'
outlimits = Batlim;
label nFailed = 'Proportion Failed';
run;
title 'Control Limits for Battery Failures';
proc print data=Batlim noobs;
run;
title 'Proportion of Battery Failures';
proc shewhart data=Battery;
pchart nFailed*Lot / subgroupn = Sampsize
limitn = 150
alln
outlimits = Clim2
yscale = percent;
label nFailed = 'Percent Failed';
run;