Bug in MAPE?

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Dataminer
Posts: 11
Joined: Thu Jul 23, 2009 2:01 am

Bug in MAPE?

Postby Dataminer » Fri May 07, 2010 2:17 am

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
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EViews Gareth
Fe ddaethom, fe welon, fe amcangyfrifon
Posts: 13585
Joined: Tue Sep 16, 2008 5:38 pm

Re: Bug in MAPE?

Postby EViews Gareth » Fri May 07, 2010 8:47 am

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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Dataminer
Posts: 11
Joined: Thu Jul 23, 2009 2:01 am

Re: Bug in MAPE?

Postby Dataminer » Mon May 10, 2010 1:53 am

Error acknowledged - thanks Gareth - update in cited section.
Gerald
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