This chart shows the running return on investments (ROI) for various cryptocurrencies. The running return on investment is defined as the profit multiple you would have had at any date if you would have bought a certain period prior to that date. The calculation therefore is to divide the current price at any point by the price X days ago. For example, the Bitcoin 1 year ROI chart gives a value of 1.83 at June 27th, 2019. This means that if you would have bought at June 27th 2018 and waited for 1 year then your return on investment would be a 1.83x or an 83% gain.
The n year ROI looks back n * 365 days for simplicity. This implies that the 2 year ROI will start at August 15th 2012 whereas the data starts on August 16th 2010. That is because 2012 is a leapyear and contains 366 days.
This chart shows the percentage that price is down since the latest all time high (ATH) as measured against their USD, BTC/ETH or any other asset valuation. Whenever a new ATH is reached then this metric has a value of 0. When price is lower than the most recent ATH then the calculation for the metric is given by ((Price – ATH) / ATH) * 100%.