Trolololo, only recently discovered this amazing work - THANK YOU (and others).

I did a bit of my own work in Excel and came up with this chart, which I think is fairly close (based on 1st of the month values in CoinMarketCap).

https://s2.postimg.org/ddzobwvpl/btc-chart-6mnth.jpg

I then made a monthly chart for BTC for the last 2.5 years and like the correlation.

https://s2.postimg.org/x7bs4m93d/btc-chart-1mnth.jpg

But I have to confess I don't completely understand the values for 10 ^ 2.66167155005961 as well as the -17.9183761889864? Could you potentially elaborate or point me in the right direction?

Reason been - I tried to evaluate ETH and had to move the START DATE from 9-JAN-2009 (for BTC) to 1-JAN-2013 (ETH?) to get an "acceptable visual correlation" (not very scientific I know). This is my best guess at the moment...

https://s2.postimg.org/l809xb3ih/eth-chart-mnth.jpg

Any help / pointers / explanation appreciated.