Control Charts
A control chart[1] is a time series graph of measurements taken from an on-going process. Control charts are visual tools that were created so that people on a factory floor could make real-time judgments about whether to intervene in a production process to adjust equipment or otherwise respond to a process that was slipping out of control. There are several types of control charts suitable for different data types and different analytical goals. In this section, we'll use a single example to introduce several techniques.
[1] Control charts are sometimes referred to as Shewhart charts after Walter Shewhart, an engineer at Bell Laboratories who introduced them in the 1930s.
Depending on the product or process being observed, we'll ...
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