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.

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: Determining 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 as a whole.

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.

Weighted average quality 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

• Work with Calculated Quality data

• About Quality Moving Forward