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.
Phase I Application of andPhase I Application of xand R Charts •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
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