1./ There's a lot of noise in the price data. Over 4 years, returns have been extremely positive, no matter the starting point.
What was better? Lump sum buys or dollar cost averaging?
2./ Lump sum has beaten dollar cost averaging by some margin. It makes sense, because of the upward skew that price displays. A buy in the past is better than a buy today.
Incremental dollars still show incredible returns.
What kind of DCA worked best? Daily, weekly, monthly?
3./ It doesn't really matter. Monthly, weekly and daily DCA have had very similar return profiles from 2014 to today