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What is the difference between 'Control Limits', 'Calculated Control Limits' and 'Historical Control Limits'?
Article Details

Last Updated
31st of May, 2018

Applies to
WinSPC 8.2, WinSPC 8.3, WinSPC 9.0

Introduction:
The chart component within Variable Analyzer, Attribute Analyzer, Dashboards and Standard Reports allow for many different visualizations of your data, most of which can be customized via Chart Schemes (formerly known as Chart Color Schemes). From within the properties of the Chart Schemes you can make visible 'Control Limits' and/or 'Historical Control Limits'

chart properties.png
'Control Limits' in the Chart Color Scheme indicates the 'Calculated Control Limits' that are actually calculated based on the data available to the Data Set. 

By default, Calculated Control Limits appear as blue solid line(s). 

'Historical Control Limits' are the limits that the operators actually saw when they collected data in Data Collection Mode. 

By default, Historical Control Limits appear as blue dashed line(s).  


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