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This may sound sily to some, but probably some of the statistic gurus might be able to help me out in explaining the control chart rules....
What is the statistic explaination for the following ?
1. Why must be 7 consecutive points that continue to increase is consider a trend ? Why not less than it ?
2. Same goes for runs...why 7 points on one side is consider a run ? or 10 out of 11 points on one side of the center line consider a run ?
Anyone care to explain on the statistical explaination ?
Many thanks
What is the statistic explaination for the following ?
1. Why must be 7 consecutive points that continue to increase is consider a trend ? Why not less than it ?
2. Same goes for runs...why 7 points on one side is consider a run ? or 10 out of 11 points on one side of the center line consider a run ?
Anyone care to explain on the statistical explaination ?
Many thanks