I believe there to be a bug in the calculation of MAPE in the forecast evaluation option to .fit and .forecast. Further details are indicated in my posting in the Program repository section.
Gerald
Bug in MAPE?
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Re: Bug in MAPE?
Posted a full response in your other thread, but, in short, I don't believe it is a bug, you're simply calculating MAPE incorrectly, by dividing by the forecast values, rather than dividing by the actual values.
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Re: Bug in MAPE?
Error acknowledged - thanks Gareth - update in cited section.
Gerald
Gerald
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