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Stratigraphic Modeling | Variation Coefficient

It is an analysis tool used to calculate the average thickness of lithologies and the coefficient of variation of thickness. The value obtained by dividing the standard deviation of a series by its arithmetic mean and multiplying by 100 is called the coefficient of variation. The coefficient of variation has no unit of measurement. The coefficient of variation can be a good measure to compare the variability of different series. 

In mining practice, after calculating the average thickness of the lithology or interval, the standard deviation is calculated. The coefficient of variation is calculated when the standard deviation found is divided by the arithmetic mean and multiplied by 100. 

OptionDescription
Borehole GroupThis is the area where the drilling groups to be calculated for the coefficient of variation are selected. Multiple group selection is possible.
Data TypeThis is the area where lithology or interval selection is made for calculation.
Interval typeThe data type is the field that is active when the Interval is selected. From this area, vein, oxidation, sulfur, alteration interval types, and intervals previously produced by interval merging and stack definition processes can be selected.
CalculateThe average thickness and coefficient of variation are calculated according to the selected parameters with the calculation process.
ReportIt allows the calculated average thickness and coefficient of variation values ​​to be reported in Excel.
Average ThicknessThis is the area where the average thickness value of the selected lithology or intervals is calculated.
Variation Coefficient

The coefficient of variation is used to determine the frequency of change of lithology/interval thicknesses in the project.









If the calculated value is below 1, it means that the lithology/interval thicknesses do not change very frequently. The distance between grid intervals used in modeling processes can be long. 

If the calculated value is above 1, it means that the lithology/interval thicknesses change very frequently. In order to achieve an accurate model, the distance between grid intervals should be determined shorter.

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