Learn how to select and use the different types of Attribute SPC charts. In this video, Dr. Richard Chua discusses the different types of SPC for attributes: p, np, u, and c charts.
- Throughout this chapter, we've discussed SPC charts.…The main purpose of SPC carts…is to enable process owners…to know when to intervene…and when to leave the process alone.…So let's take some time now to explore SPC Charts'…four attributes, where discrete data is used.…There are four types of Attribute SPC Charts.…They are P-chart, which plots the proportion…of defective units.…For example, the proportion of invoices…processed incorrectly.…
There is also the NP-chart…where the number of defective units are plotted.…For example, number of invoices processed incorrectly.…Next is the C-chart which plots the number of defects.…For example, number of errors in invoices.…And finally, the U-chart…which plots the number of defects per unit.…For example, number of errors per invoice.…Here's an example of an NP chart showing number of rejects.…
The mean number of rejected items is 12…at the center line.…The process is out of control…because there is a data point above the upper control limit.…It should be investigated and corrective action taken.…
Dr. Richard Chua builds upon his Six Sigma Foundations and Learning Minitab courses, and covers an array of topics, including measurement system analysis, descriptive statistics, hypothesis testing, design of experiments, statistical process control, and more.
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- Six Sigma and the organization
- Collecting the voice of the customer
- Project management basics
- Process maps
- Sampling in data collection
- Measurement system analysis
- Measuring performance using descriptive statistics
- Process performance measures
- Hypothesis testing
- Testing for means, variances, proportions, and independence
- Correlation and regression
- Using selection matrices
- Using failure modes and effects analysis
- Developing control plans
- Statistical process control