Lecture_10_26

Lecture_10_26 - Lecture of Oct 26 Remember attending the...

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1 Lecture of Oct 26 Lecture of Oct 26 Remember attending the lab session tomorrow. HW#7 due Tuesday, Oct 31. Last Class : How to measure the performance of a control chart? - Why not use α -error or β -error? - What is run length and average run length (ARL)? - Why we have two types of ARL (ARL 0 and ARL 1 )? - What ARL values indicate a good performance? - How are they related to the α -error or β -error?
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2 Performance of Control Chart Performance of Control Chart • Run Length and Average Run Length - Run Length (RL), the sample number on which a control chart signals , that is, when a data point is outside the control limits. -RL ±is±a± random variable . Using RL itself cannot serve the performance benchmarking purpose. Average RL (ARL) is defined as the expected number of RL, or expected number
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3 Performance of Control Chart Performance of Control Chart • Two Types of ARL - in-control ARL (ARL 0 ) : is the expected number of samples
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Lecture_10_26 - Lecture of Oct 26 Remember attending the...

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