It does this by drawing information from all 28 major pairs. It then takes two simple moving averages, one short-term and one long-term, and compares and normalizes the difference between these two (this difference is called relative ). These relative volumes for each pair are then averaged together to find the relative for the entire currency. If relative is greater than 0, then the currency is experiencing higher than average as a whole. If relative is less than 0, the currency as a whole is experiencing low .
This can be used as a starting point to find specific pairs that are experiencing high volumes, or to determine which currencies are likely to undergo major changes in the near future.