About Calculated Quality

Calculated Quality takes source data from a Material Quality reporting point, typically associated with the same equipment as the Calculated Quality reporting point, and performs a calculation on the combined data contents of lot groups.

Important: The processing of Calculated Quality to estimate quality information is part of Inventory reprocessing. When a Quality record is updated (Quality event is created), both Material Quality and Calculated Quality records are not updated until Inventory reprocessing is complete.

Field matching for Calculated Quality and Material Quality reporting points

When you create fields under a Calculated Quality reporting point, AVEVA™ Production Management matches those fields with fields of the same name under a Material Quality reporting point.

Guidelines for field matching

• The name of the field is required to be the same in both reporting points.

• AVEVA™ Production Management performs a scan through the children of the equipment up to the children of the parent site until it finds a Material Quality reporting point with a field that has the same name.

• If more than one matching Material Quality reporting point is found, AVEVA™ Production Management uses the first match, which is in closest proximity to the Calculated Quality reporting point.

Explaining Calculated Quality

Calculated Quality can perform a calculation on source data from a Material Quality reporting point to determine a quantity of material.

Example

The scenario in this example is to determine the amount of ash present in a coal stockpile.

• Quality samples are taken when the coal is put onto the stockpile to determine the ash percentage.

• The amount of coal being put onto the stockpile is recorded and used to derive a calculated inventory value for the quantity of ash that was added.

• The calculated inventory values are used to weight the overall quality value that is assigned to the stockpile.

Aggregation type

Currently, the aggregation type for Calculated Quality is Weighted Average Quality (WAQ), which is calculated based on the qualities of lots in a lot group.

WAQ is a method to determine quality of a material by means of the weighted average. Weighted average is a common type of mathematical average or mean. It is a mean that is computed with extra weight given to one or more elements of the sample.

The weighted average produces a more accurate result than a regular average.

Related topics

• About Inventory

• Understand Inventory data reprocessing

• How to set up Calculated Quality

• Configure Calculated Quality hierarchy

• Work with Calculated Quality