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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 .

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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