I can see your point. I guess my description wasn't precise enough. Thanks for going into the details.
It's like when you say : i made that trade and i loss X.
X could be absolute value (dollar amount) or in percentage (compared to the margin required for example).
In this case, because the decay in the scanner is primarily used to compare the decay between stocks, i believe it's better to have a number that is independent from the level of the RV.
(ARVT=0 - ACRV) / D would be dependent on the level of the RV : it's going to be difficult to compare the decay between a stock where the RV is 5% compare to another stock where the RV is 10%
(ARVT=0 - ACRV) / ACRV / D is independent of the level of the RV, and gives a rough idea on the percentage loss per day of the average RV between current T and T=0.
Let me know if that makes sense. I think the percentage version is better to use as a filter between stocks.
I can at least change the hover text description to say 'percentage'.