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;roi: document calculation failures

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Simon Michael 2020-11-18 10:43:16 -08:00
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hledger/Hledger/Cli/Commands/Roi.md
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@ -22,6 +22,13 @@ time-weighted rate of return (TWR) for your investments for the time
period requested. Both rates of return are annualized before display,
regardless of the length of reporting interval.
Note, in some cases this report can fail, for these reasons:
- Error (NotBracketed): No solution for Internal Rate of Return (IRR).
Possible causes: IRR is huge (>1000000%), balance of investment becomes negative at some point in time.
- Error (SearchFailed): Failed to find solution for Internal Rate of Return (IRR).
Either search does not converge to a solution, or converges too slowly.
Examples:
- Using roi to report unrealised gains: