For a given geography (US, or PADD): COVERAGE = (# of visible transactions over 7 days) / (# visible transactions over 7 days + # missing transactions over 7 days).
Where # visible transactions is a count of BOLs (the same ones used in RFD to get product/volume) and # missing transactions is the number of inferred transactions based on gaps in the BOL sequence.
COVERAGE_FACTOR = COVERAGE / SECRET_SCALE_FACTOR
where SECRET_SCALE_FACTOR = COVERAGE for the US on 2017-01-01