# Quality Progress - January 2015 - 8

EXPERTANSWE Q: I have about 10 paper testing instruments that my organization uses to measure paper standards. Every different location (there are eight total) uses the same type of instrument, test procedure and the same paper standard out of the I-MR chart of instrument No. 10 Individual value Understanding control charts admit that I am lost. I need to know which statistical process control chart to use Moving range send me the results. I am new and hate to that I can dump the data into and, at the UCL = 2.916 − X = 1.721 1 LCL = 0.527 1 much as possible. 1 2 same lot. This reduces the variability as The labs collect 10 test data points and 1 3 / FIGURE 1 11 21 31 41 51 61 Observation 71 81 1.6 91 1 UCL = 1.467 1.2 0.8 − MR = 0.449 0.4 0.0 LCL = 0 1 same time, save time. I would like to see 11 21 31 41 51 61 Observation the center line, upper and lower limit lines, and when a test or instrument result is out 71 81 91 UCL = upper control limit LCL = lower control limit I-MR = individual values/moving range of the limits. The last person also showed the limit lines of the 10 data points from each instrument. This was his designed X-bar-S chart of instrument No. 10 gram with him. I also have a low budget and don't want to be reprimanded for both problems. I would appreciate all the help you could possibly provide. Sample mean program. When he left, he took the pro- 2.2 1.6 1.4 ent ways: 1. For each instrument, use an individual values/moving range (I-MR) chart to quickly determine if any individual data LCL = 1.3165 2 3 4 5 6 Sample 7 8 9 10 0.8 Sample StDev would be to chart the data in three differ- − X = 1.7214 1.8 A: Control charts would be an excellent ment result is outside limits. One approach UCL = 2.1263 2.0 1 tool to determine when a test or instru- / FIGURE 2 UCL = 0.7125 0.6 − S = 0.4151 0.4 0.2 LCL = 0.1178 1 2 3 4 5 6 Sample point is outside limits. 2. For each instrument, use an average/ 7 8 9 10 UCL = upper control limit LCL = lower control limit StDev = standard deviation X-bar-S = average/standard deviation standard deviation (X-bar-S) chart with the subgroup size of 10 test data points to determine if each particular instru- and use another X-bar-S chart to deter- device and analyzed as an example of the ment is performing as it should on that mine if the instruments as a whole are proposed techniques. particular day. performing as usual. 3. Take the averages from each subgroup from each instrument on a given day, 8 QP * www.qualityprogress.com To demonstrate, electrical sensitivity data in millivolts were obtained on a 1. I-MR chart on each measurement. Plot all the points obtained on each instrument on separate charts for each http://www.qualityprogress.com

Up Front
LogOn
Keeping Current
Narrow(er) Focus
Dissecting the Differences
Separate Steps
Innovation Imperative
Measure for Measure
Quality in the First Person
Career Corner
Statistics Roundtable
Standards Outlook
QP Toolbox
QP Reviews
One Good Idea
Back to Basics

# Quality Progress - January 2015

https://www.nxtbook.com/naylor/ASQM/ASQM0719
https://www.nxtbook.com/naylor/ASQM/ASQM0619
https://www.nxtbook.com/naylor/ASQM/ASQM0519
https://www.nxtbook.com/naylor/ASQM/ASQM0419
https://www.nxtbook.com/naylor/ASQM/ASQM0319
https://www.nxtbook.com/naylor/ASQM/ASQM0219
https://www.nxtbook.com/naylor/ASQM/ASQM0119
https://www.nxtbook.com/naylor/ASQM/ASQM1218
https://www.nxtbook.com/naylor/ASQM/ASQM1118
https://www.nxtbook.com/naylor/ASQM/ASQM1018
https://www.nxtbook.com/naylor/ASQM/ASQM0918
https://www.nxtbook.com/naylor/ASQM/ASQM0818
https://www.nxtbook.com/naylor/ASQM/ASQM0718
https://www.nxtbook.com/naylor/ASQM/ASQM0618
https://www.nxtbook.com/naylor/ASQM/ASQM0518
https://www.nxtbook.com/naylor/ASQM/ASQM0418
https://www.nxtbook.com/naylor/ASQM/ASQM0318
https://www.nxtbook.com/naylor/ASQM/ASQM0218
https://www.nxtbook.com/naylor/ASQM/ASQM0118
https://www.nxtbook.com/naylor/ASQM/ASQM1217
https://www.nxtbook.com/naylor/ASQM/ASQM1117
https://www.nxtbook.com/naylor/ASQM/ASQM1017
https://www.nxtbook.com/naylor/ASQM/ASQM0917
https://www.nxtbook.com/naylor/ASQM/ASQM0817
https://www.nxtbook.com/naylor/ASQM/ASQM0717
https://www.nxtbook.com/naylor/ASQM/ASQM0617
https://www.nxtbook.com/naylor/ASQM/ASQM0517
https://www.nxtbook.com/naylor/ASQM/ASQM0417
https://www.nxtbook.com/naylor/ASQM/ASQC12518
https://www.nxtbook.com/naylor/ASQM/ASQM0317
https://www.nxtbook.com/naylor/ASQM/ASQM0217
https://www.nxtbook.com/naylor/ASQM/ASQM0117
https://www.nxtbook.com/naylor/ASQM/ASQM1216
https://www.nxtbook.com/naylor/ASQM/ASQM1116
https://www.nxtbook.com/naylor/ASQM/ASQM1016
https://www.nxtbook.com/naylor/ASQM/ASAC0016
https://www.nxtbook.com/naylor/ASQM/ASQM0916
https://www.nxtbook.com/naylor/ASQM/ASQA0016
https://www.nxtbook.com/naylor/ASQM/ASQM0816
https://www.nxtbook.com/naylor/ASQM/ASQM0716
https://www.nxtbook.com/naylor/ASQM/ASQM0616
https://www.nxtbook.com/naylor/ASQM/ASQM0516
https://www.nxtbook.com/naylor/ASQM/ASQM0416
https://www.nxtbook.com/naylor/ASQM/ASQM0316
https://www.nxtbook.com/naylor/ASQM/ASQM0216
https://www.nxtbook.com/naylor/ASQM/ASQM0116
https://www.nxtbook.com/naylor/ASQM/ASQM1215
https://www.nxtbook.com/naylor/ASQM/ASQM1115
https://www.nxtbook.com/naylor/ASQM/ASQM1015
https://www.nxtbook.com/naylor/ASQM/ASQM0915
https://www.nxtbook.com/naylor/ASQM/ASQM0815
https://www.nxtbook.com/naylor/ASQM/ASQM0715
https://www.nxtbook.com/naylor/ASQM/ASQM0615
https://www.nxtbook.com/naylor/ASQM/ASQM0515
https://www.nxtbook.com/naylor/ASQM/ASQM0315
https://www.nxtbook.com/naylor/ASQM/ASQM0215
https://www.nxtbook.com/naylor/ASQM/ASQM0115
https://www.nxtbook.com/naylor/ASQM/ASQM1214
https://www.nxtbook.com/naylor/ASQM/ASQM1114
https://www.nxtbook.com/naylor/ASQM/ASQM1014
https://www.nxtbook.com/naylor/ASQM/ASQM0914
https://www.nxtbook.com/naylor/ASQM/ASQM0814
https://www.nxtbook.com/naylor/ASQM/ASQM0714
https://www.nxtbook.com/naylor/ASQM/ASQM0614
https://www.nxtbook.com/naylor/ASQM/ASQM0514
https://www.nxtbook.com/naylor/ASQM/ASQM0414
https://www.nxtbook.com/naylor/ASQM/ASQM0314
https://www.nxtbook.com/naylor/ASQM/ASQM0214
https://www.nxtbook.com/naylor/ASQM/ASQM0114
https://www.nxtbook.com/naylor/ASQM/ASQM1213
https://www.nxtbook.com/naylor/ASQM/ASQM1113
https://www.nxtbook.com/naylor/ASQM/ASQM1013
https://www.nxtbook.com/naylor/ASQM/ASQM0913
https://www.nxtbook.com/naylor/ASQM/ASQM0813
https://www.nxtbook.com/naylor/ASQM/ASQM0713
https://www.nxtbook.com/naylor/ASQM/ASQM0613
https://www.nxtbook.com/naylor/ASQM/ASQM0513
https://www.nxtbook.com/naylor/ASQM/ASQM0413
https://www.nxtbook.com/naylor/ASQM/ASQM0313
https://www.nxtbook.com/nxtbooks/naylor/ASQM0213
https://www.nxtbook.com/nxtbooks/naylor/ASQM0113
https://www.nxtbook.com/nxtbooks/naylor/ASQM1212
https://www.nxtbook.com/nxtbooks/naylor/ASQM1112
https://www.nxtbook.com/nxtbooks/naylor/ASQM1012
https://www.nxtbook.com/nxtbooks/naylor/ASQM0912
https://www.nxtbookmedia.com