A article of Epilepsy Research [Statistical Process Control (SPC): A Simple Objective Method for Monitoring Seizure Frequency

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A article of Epilepsy Research [€œStatistical Process Control (SPC): A Simple Objective Method for Monitoring Seizure Frequency and Evaluating Effectiveness of Drug Interventions in Refractory Childhood Epilepsy,€ (2010, Vol 91,pp. 205€“213)] used control charts to monitor weekly seizure changes in patients with refractory childhood epilepsy. The following table shows representative data of weekly observations of seizure frequency (SF).


Week 3 4 5 10 SF 13 10 17 10 18 14 10 12 16 13 Week 12 11 13 14 15 16 17 18 19 20 SF 14 11 11 10 3 13 15 21 Week 21 22 2


(a) What type of control chart is appropriate for these data? Construct this chart.

(b) Comment on the control of the process. 

(c) If necessary, assume that assignable causes can be found, eliminate suspect points, and revise the control limits.

(d) In the publication, the weekly SFs were approximated as normally distributed and an individuals chart was constructed. Construct this chart and compare it to the attribute chart you built in part (a).

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Applied Statistics And Probability For Engineers

ISBN: 9781118539712

6th Edition

Authors: Douglas C. Montgomery, George C. Runger

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