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Subject: ODFF: IRR
IRR as documented by Excel returns an error in Excel under certain conditions (if the guess is wrong). ODFF needs to say if this is legitimate behaviour or not. Note that a less naive implementation could perhaps be designed, eg when solving for <5 terms (or certainly for 2 terms as in the error example that Excel Help gives). Iteration is theoretically necessary for 6+ terms I think. The accuracy to be achieved needs at least a mention, even if it is not to be mandated. David King
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