Subgrades calculation
How subgrades are determined
The overall grade on the front of the label is not a simple average of the eight partial grades on the back of the label. The overall grade is calculated using a specially developed and adapted multiplier , which determines the final grade of the eight sub-grades or partial grades.
It should also be noted that the rating of the front of a card carries more weight in percentage terms than the back.
The lowest partial grade is given the greatest weight when determining the overall grade, as it has the greatest apparent deficiency. It therefore pulls the overall rating down.
It is also worth emphasizing that our entire evaluation process is coordinated. Each card is re-evaluated in a second, independent evaluation process and is ultimately evaluated using an eight-eyes principle.
If there are any deviations, the card in question goes through the complete decision-making process again.
In the following, we list - as briefly as possible - the individual phases of the evaluation process.
However, we would like to point out clearly at this point that this is only a small indication for calculating the overall grade.
Explanation in steps
1. Identifying defects
The individual sub-areas of Corners, Centering, Surface and Edges are each divided into Front (F) and Back (B). This guarantees the highest level of accuracy in the evaluations.
Example
Centering = F 9.5 / B 9.0
Corners = F 9.5 / B 9.5
Edges = F 9.0 / B 8.5
Surface = F 9.5 / B 9.5
2. Ratio test
To get an overall score for the sub-areas, the front and back areas are combined. The front area carries a little more weight in percentage terms. This gives us the overall scores for the individual sub-areas of corners, centering, surface and edges.
Example
Centering front & back = 9. ...
Corners front & back = 9. ...
Edges front & back = 8. ...
Surface Front & Back = 9. ...
3. Determine final grade
The overall score is determined from the data obtained in the previous step from the areas of corners, centering, surface and edges.
The calculation is carried out using a specially developed multiplier and is standardized . The individual overall grades are calculated in our system to 5 decimal places.
This guarantees an exact determination of the final grade.
The lowest partial grade is given the greatest weight in determining the overall grade, as it has the greatest identifiable deficiency.
Example of a rating of 9.0
Centering = F 9.5 / B 9.0
Corners = F 9.5 / B 9.5
Edges = F 9.0 / B 8.5
Surface = F 9.5 / B 9.5
Final grade = 9.0
The map received a 9.0 because the edges were the lowest individual grade with the grades 9.0 and 8.5. The 9.5 grades and the 9.0 grades were not strong enough in total to reach the next highest overall grade.
An extreme example
Centering = F 9.5 / B 9.5
Corners = F 9.5 / B 9.5
Edges = F 9.5 / B 9.5
Surface = F 2.0 / B 2.0 (significant defects)
Final grade = 3.0
With our extreme example, we would like to make it clear that the overall grade is not an average grade of the individual sub-areas.
At first glance, it may seem like this card should have received an overall rating other than a 3.0.
It should be noted, however, that the final grade is rarely, if ever, two levels above the lowest of the eight grades. In the case of this map, the major defect in the surface area is responsible for the 3.0 rating. However, a map with such a damaged surface cannot receive a better overall grade.