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advanced control charts, Creating and Reading Control Charts in Minitab,…
advanced control charts
X-bar & R Chart
Data is variable (continuous)
- Data can be grouped into subgroups, letting you chart the mean of each group - Data count in each subgroup is less than 8
Presents two charts
X-bar & S Chart
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- Data can be grouped into subgroups, letting you chart the mean of each group
- Data count in each subgroup is more than 8
- Sigma can be easily calculated (otherwise, use x-bar &R)
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I & MR Chart
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- Data is variable (continuous)
- Data cannot be easily grouped into reasonable subgroups, so you must track individual data points
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o Production is veryslow ,so waiting for enough data to create subgroups would take too
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P-Chart
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- Data is presented as a percent (percent defective) rather than a count
- Doesn’t require a constant sample/subgroup size
- Plots the proportion of units that are nonconforming (are defective, don’t meet specifications)
NP-Chart
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- Data is presented as a percent (percent defective) rather than a count
- Does require a constant sample size to be of use; other than this, you can use it for anything that
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- Plots the number of units that are nonconforming in each sample size
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U-Chart
U chart
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- Data is presented as a count (number of defects)
- Doesn’t require a constant sample/subgroup size
- Plots the number of defects per unit
- Use when data is about the defects themselves, not the overall defective product
C-Chart
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- Data is presented as a count (number of defects)
- Does require a constant sample/subgroup size
- Plots the number of defects per sample
- Use when data is about the defects themselves, not the overall defective product
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