From the course: Six Sigma: Green Belt
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SPC charts for variables
- 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 plot individual values. For example, processing time of invoices. That's also the individual moving range chart. I-MR chart, where in addition to 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 limits, but there are other signals that show out of control, besides going beyond the upper and lower control limits. Here's…
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