The modified Dietz return is typically calculated in steps. The following example illustrates the method of calculation:
If the beginning and end market values of an investment are $500 and $600, respectively (including any accrued income), and a cash flow occurs on the 25th of a 30-day month, then:
First step: calculate the adjusted factor
CF adjustment factor = (30-25)/30 = 0.1667
Second step: adjust the cash flow
Adjusted cash flow= CFi x adjustment factor
Adjusted cash flow= 60 x 0.1667 = $10
Third step: plug the modified cash flow in the formula of return calculation
Modified Dietz return = [(600-500-60)/ (500+10)] x 100 = 7.84%
This return, as shown in the above example, is affected by both the timing and size of the cash flows during the measurement period.
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