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| What is the difference between a Data Set List Filter and a Data Set Data Filter? |
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Last Updated
30th of July, 2010
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In WinSPC Version 8.0, data set list filters and data set data filters are the two types of filters that can be applied to content in a WinSPC database to create a data set.
A data set list filter is used to limit the list of items (parts or variables) from which data will be retrieved for the data set. The data set list filter is so named because, in the Data Set Builder (the tool used to build a data set in WinSPC), the parts or variables in the WinSPC database are displayed in a list. When a data set is first created, prior to any filters being applied, the list contains the names of all the parts or variables in the database. As list filters are applied, the list narrows. You may have, for example, a WinSPC database that has 100 variables but you may not be interested in data for all 100 variables at the moment. Instead, you may only be interested in data from those variables which begin with the letter 'A'. In such a case, you would employ a list filter.
A data set data filter is used to limit the data (readings and subgroups) associated with the parts or variables in the data set list. Continuing the above example, if no data filter is applied to the list of variables which begin with the letter 'A', the data set will consist of all data ever collected for those variables. If you only wanted data collected within the past year for those variables, you would employ a data filter.
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