GB/T 17989.6-2022
Statistical method of quality control in production process—Control charts—Part 6: EWMA control charts

Standard No.

GB/T 17989.6-2022

Language

Chinese

Release Date

2022

Published By

国家市场监督管理总局、中国国家标准化管理委员会

Lastest

GB/T 17989.6-2022

Scope

This document gives guidance on understanding and applying exponentially weighted moving average (EWMA) control charts for statistical process control. EWMA control chart is a statistical process control technique used to monitor the small fluctuations of the process mean, and it can detect the small and medium fluctuations of the process mean in time. The EWMA control chart evaluates the process mean by means of an exponentially weighted moving average of the sample mean of all historical data. EWMA weights the samples in a geometrically decreasing manner from near to far from the current position. The closer to the current sample, the greater the weight, the greater the impact, and the farther the sample, the smaller the weight, and the smaller the impact. The specific weight depends on in the smoothing parameter (λ). This document applies to situations where control charts are used to monitor small fluctuations in the process mean. Note 1: The main objective of the EWMA chart is the same as that of the conventional control chart. The relevant contents of conventional control charts have been described in GB/T17989.2. the following situations

GB/T 17989.6-2022 history

• 2022 GB/T 17989.6-2022 Statistical method of quality control in production process—Control charts—Part 6: EWMA control charts

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