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How does historical data get adjusted for dividends, exactly?
If you download the historical data from Yahoo, you will see two different close prices. The one labeled 'Close' is simply the price that was quoted on that particular day. The one labeled 'Adj Close' is the close price that has been adjusted for any splits and dividends that have occurred after that date.  For example, if a stock splits 10:1 on a particular date, then the adjusted close for all dates prior to that split will have been divided by 10. If a dividend is paid, then all dates prior will have that amount subtracted from their adjusted quote. Using the adjusted close allows you to compare any two dates and see the true relative return.