Re: Reg Unit required?
I forgot to mention in my previous reply that the unit actually used by practitioners is usually the 'nol': 'normalised oppy, logarithmic'. The value in nols is defined as the natural logarithm of the value in oppys, + ln[5111/90] + 1. It is easy to check that a mission with a nol value of 1 lasted for its expected time, a mission which was a total failure has a nol value of negative infinity, and Opportunity had a nol value of 1 + ln(5111/90). nols are particularly useful as they are around 1 for the expected mission duration, while oppys are rather small values then. nols are not SI units.
Biting the hand that feeds IT
