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When I download historical data from yahoo finance, only the closing price is adjusted for dividends/splits.

Is there a way of figuring out the factor by which lets say the highs/lows have to be multiplied in order to adjust them for splits/dividends?

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Yahoo finance describes their method at https://help.yahoo.com/kb/finance/SLN2311.html?impressions=true and indicate that this follows the CRSP method for adjusting prices, dividends, and volumes. The CRSP calculations are described in detail at http://www.crsp.com/products/documentation/crsp-calculations .

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Yes.

factor = adjusted closing price / (unadjusted) closing price

Adjusted high = high * factor

Adjusted low = low * factor

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