I have downloaded the historical prices from Yahoo Finance: Date,Open,High,Low,Close,Volume,Adj Close 1984-09-07,26.50,26.87,26.25,26.50,2981600,3.02 I want to split adjust them to get (figures in Yahoo chart): 3.3125,3.3588,3.2812,3.3125 I see I can do it by dividing each price by 8 (ie 26.25/8=3.28125). But I don't see how to derive the devider 8 from data line(s). Any ideas ? How to make use of the "Adj Close" parameter ?