This is an oscillator version of the above. When the indicator is at/near 1 then Bitcoin price is at/near the upper range of it's longterm logarithmic growth trend. When at/near 0 then price is at/near the lower range of that trend.
This indicator only works with the BLX Brave New Coin Index (ticker:BLX) and only on 1 day, 3 day, or 1 week timeframes.