
How is the SiteScore^{TM} calculated ? 
The SiteScore^{TM} is a simple and easy indication of the quality of any group or cartridges or drives. It is based on the VeriScore^{TM} and it works just like it. A score of zero is very bad and a score of 100 is perfect.
It is however not just the average of the VeriScore^{TM} numbers.
Consider this example of two sites. Each site has two cartridges (they are small sites). Site one has a cartridge with a score of 100 and one with a score of 60. The average is (100+60)/2 = 80.
Site two has two cartridges with a score of 80 each. The average is of course 80.
So both sites have the same average quality score. However, we much prefer the second site. Its cartridges both have a respectable score of 80 and they are expected to perform well.
The first site has a cartridge with a perfect score of 100, which is nice. But the second cartridge has a problematic score of 60 and could cause problems.
Preferrably, the VeriScore numbers for all cartridges in a group are within a narrow range. Mathematically, this range is expressed by the standard deviation.

A high standard deviation indicates a wide range. A low standard deviation mean that the range is narrow, and a standard deviation of 0 means that there is no difference between the cartridges.
So we need to look at the average and the standard deviation. This is what the SiteScore does.
When the standard deviation is high, the SiteScore is lower than the average score, while a site with a low standard deviation of the quality scores will have a SiteScore that is higher than the average.
On our example the SiteScore of site one is 71, which is lower than its average score of 80. The SiteScore of site two is 85, an increase over its average score of 80.

 Site 1  Site 2 
Cartridge 1 VeriScore  100  80 
Cartridge 2 VeriScore  60  80 
Average  80  80 
SiteScore  71  85 

The SiteScore gives you the ability to easily compare the quality of different groups of cartridges by just looking at one number.

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