Control chart for variable Xbar & R chart is most referable for more than 2 subgroup. Attribute data P chart, C chart. It's useful for 1.Prediction on product and process variations 2 .

Learn how to use control charts in TQM, a tool for quality management that can help you monitor, analyze, and improve your processes, products, or services.

Control charts have two general uses in an improvement project. Undeniably, the most common application is as a tool to ...

Key Points Variable and attribute data are used in the creation of control charts. You can use both types of data to measure performance or KPIs. Variable and attribute data can be further ...

Attribute-based control consists in controlling the quality of a qualitative variable by enumeration. This type of chart is generally used to monitor a quantity or proportion of defects or ...

A drawback of control charts for attributes is that larger sample sizes are required than those for variables. The chapter explores four types of control charts for attributes: the p control chart, np ...

The positions of variables in a SAS data set affect the order in which they appear in the output of SAS procedures, unless you control the order within your program, for example, with a VAR statement.

The use of statistical process control (SPC) charts in healthcare is increasing. The primary purpose of SPC is to distinguish between common-cause variation which is attributable to the underlying ...

An optimization scheme of designing a variable-sample-size attribute control chart is presented. The adjustment on sample size is based on the current process status observations for faster detection ...