What type of data does a control chart typically use?

Control charts primarily use continuous data, which consists of measurements that can take on any value within a given range. Continuous data is quantifiable and allows for more precise analysis of process behavior over time. A control chart tracks this data against predetermined control limits to monitor variations and identify any trends or shifts in the process.

Continuous data, such as time, weight, temperature, or length, is well-suited for control charts because it can provide insights into the variability of a process. This ability to measure performance statistically is what makes control charts an essential tool in quality management and process improvement within the Six Sigma framework.

In contrast, categorical, qualitative, and nominal data represent different forms of information that do not lend themselves to the same type of statistical analysis applicable to continuous data, thus making the use of control charts ineffective for those data types.