FINANCE.XIRR
FINANCE.XIRR(amounts..., dates..., rate_guess = 0.1)
Calculates the internal rate of return for a schedule of cash flows. The amounts and dates parameters must be the same length.
The first amount should correspond to the first date, and so on.
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amounts: List of incomes associated with the investment.
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dates: List of dates associated with the income amounts.
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rate_guess: An estimate for the internal rate of return. Defaults to 0.1.
FINANCE.XIRR(amount1, amount2, amount3, date1, date2, date3, 0.5)