In this video, Dr. Richard Chua discusses two types of SPC charts, I-charts and I-MR charts, these are charts for variables. He also discusses the eight out of control conditions for variable SPC charts.
- SPC charts provide the signal to process owners…as to when to intervene and when to leave the process alone.…There are two types of SPC charts:…those for variables using continuous data,…such as dimensions and time,…and SPC charts for attributes, using discrete data…such as counts of defects and proportions.…SPC charts for variables include:…Individual or I-Chart which plots individual values.…For example, processing time of invoices.…
There's also the individual moving range chart, I-MR chart,…where in addition the individual value,…the moving range of processing times are also charted.…The moving range is the current value minus previous value.…Here's an example of an I-MR chart for weight.…This process is not in control.…Because we can see that there are data points…that fall outside of the upper control limit.…But there are other signals that show out of control,…besides going beyond the upper and lower control limits.…
Here's the complete list of the signals…indicating out of control conditions.…There are eight out of control conditions…
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.
Lynda.com is a PMI Registered Education Provider. This course qualifies for professional development units (PDUs). To view the activity and PDU details for this course, click here.
The PMI Registered Education Provider logo is a registered mark of the Project Management Institute, Inc.
- 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