Transcription of Chapter 6. Control Charts for Variables
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Chapter 6. Control Charts for Variables
Chapter 6. Control Charts for VariablesControl Charts for and xR: quantity of interest ( , )xxN 12,,: samples of , xNn Subgroup Data with Unknown and gp : grand average of , best estimate for xx 12,,: ranges of I Application of andRChartsxPhase I Application of and RCharts Equations 5-4 and 5-5 are trial Control Determined from minitial samples. Typically 20-25 subgroups of size nbetween 3 and 5. Any out-of- Control points should be examined for assignable ypgcauses. If assignable causes are found, discard points from calculations and revise the trial Control limits. Continue examination until all points plot in Control Continue examination until all points plot in Control . Adopt resulting trial Control limits for use. If no assignable cause is found, there are two point as if an assignable cause were found and revise point as if an assignable cause were found and revise Retain point and consider limits appropriate for Control .
•Eqq uations 5-4 and 5-5 are trial control limits. – Determined from m initial samples. • Typically 20-25 subgroups of size n between 3 and 5. – Any out-of-control ppgoints should be examined for assignable causes. • If assignable causes are found, discard points from calculations and revise the trial control limits.
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