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Reference.org
Modified Dietz method
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<p>The modified Dietz method is a measure of the <i>ex post</i> (i.e. historical) performance of an <a href="/facts/Investment_portfolio/hTnbPr1C">investment portfolio</a> in the presence of external flows. (External flows are movements of value such as transfers of cash, securities or other instruments in or out of the portfolio, with no equal simultaneous movement of value in the opposite direction, and which are not income from the investments in the portfolio, such as interest, coupons or dividends.) </p><p>To calculate the modified Dietz return, divide the gain or loss in value, net of external flows, by the average capital over the period of measurement. The average capital weights individual cash flows by the length of time between those cash flows until the end of the period. Flows which occur towards the beginning of the period have a higher weight than flows occurring towards the end. The result of the calculation is expressed as a percentage <a href="/facts/Rate_of_return/CldGgD1f">return</a> over the holding period. </p>