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

Table of Contents for the Digital Edition of Quality Progress - January 2015

Up Front
LogOn
Expert Answers
Keeping Current
Mr. Pareto Head
Total Quality’s Leader
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

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