I am confused. Yes, finance.yahoo.com adjusted Closing stocks prices take into account dividends and splits, but how do you factor into the Returns calculations that the stock/ETF has paid out a dividend? Do you also download a dividend history and add that back in to the calculations?
(adjusted close day two minus adjusted close day one) / adjusted close day one
is % gain for day two. Everything (I think!) is already built into the adjusted closes so no need to add anything back, etc.
I would love to learn I'm wrong, then there might actually be something that can beat the QQQs!