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control chart question

Six Sigma – iSixSigma Forums Old Forums General control chart question

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    I need to create control chart for cost data for a project.  The data is reported on a monthly basis and the value is cummulative.  The data the team wants to used is the Cost Performance Index (Budgeted Cost/Actual Cost).  I did not think you could use cummulative data for contol charting….the data is no longer independent.   Is my thinking correct or can I use the cummulative data??? 

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