What is EWMA-chart in SAP QM - Quality Management?

SAP Term: EWMA-chart

• Component: QM

• Component Name: Quality Management

• Description: A control chart type that represents exponentially weighted moving averages EWMA. This variant of the Shewhart chart is suitable for use with small sample sizes and the sample size n=1. The EWMA leads to narrower control limits than in a normal mean value chart, and therefore even the slightest changes in the location of the value distribution can be recognized.

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• Key Concepts: 
  EWMA-chart stands for Exponentially Weighted Moving Average chart. It is a statistical tool used in Quality Management (QM) in SAP to monitor process stability and detect small shifts in the process. It is used to identify trends and patterns in data over time.
  
  How to use it: 
  EWMA-chart is used to monitor process stability and detect small shifts in the process. It is used to identify trends and patterns in data over time. The chart is created by plotting the exponentially weighted moving average of the data points over time. The chart can be used to detect changes in the process that may not be visible with other methods.
  
  Tips & Tricks: 
  When using an EWMA-chart, it is important to set the parameters correctly. The parameters should be set based on the type of data being monitored and the desired sensitivity of the chart. It is also important to ensure that the data points are evenly spaced over time, as this will ensure that the chart is accurate and reliable.
  
  Related Information: 
  EWMA-chart is related to other statistical tools such as Shewhart charts, which are used for similar purposes. It can also be used in conjunction with other methods such as control charts and process capability analysis to gain a better understanding of a process.