Talk:Mean absolute percentage error

The formula is not the same as what I learned in my business class right now. ~Fulano (visitor)


 * What formula did you learn, and do you have a source? Paul2520 (talk) 15:02, 19 September 2013 (UTC)

Do not merge other error metrics with this article
Please do not merge WMAPE or any other article into this! WMAPE is not an "alternative definition of MAPE" as some of the unfortunate edits suggest. Wikipedia has separate articles for different metrics: Mean Absolute Scaled Error (MASE), Symmetric Mean Absolute Percentage Error (sMAPE), Mean Directional Accuracy (MDA) etc. and should continue to have so. — Preceding unsigned comment added by Manu.m (talk • contribs) 07:45, 30 June 2022 (UTC)

Percentage & multiplication by 100
In the current form, the formula is


 * $$\mbox{MAPE} = \frac{100}{n}\sum_{t=1}^n \left|\frac{A_t-F_t}{A_t}\right| $$

The article then says "The MAPE is also sometimes reported as a percentage, which is the above equation multiplied by 100". Isn't the formula already multiplied by 100?91.68.56.209 (talk) 07:16, 16 June 2021 (UTC)

Reorganize the article
This article should be restructured because

- issues related to the MAPE are listed both in introduction and in the section "issues"

- it lacks a section on MAPE regressions, since this is also very popular metric in Machine Learning (like Mean squared error)

(unsigned, posted by Adm4749d) North8000 (talk) 23:33, 13 December 2018 (UTC)

Source
A good source for the formula is the following article: https://www.sciencedirect.com/science/article/pii/S0169207016000121

--PoulsHaut (talk) 13:05, 9 December 2021 (UTC)

Proposed merger
I propose merging WMAPE into Mean absolute percentage error. Weighted MAPE is merely a variation of MAPE. Having two separate articles is potentially redundant and results in significant overlap. Merger is recommended per WP:OVERLAP.

I performed the merger on June 4. See edits to WMAPE and MAPE. The merger was reverted on June 30, so I am now seeking consensus on whether to merge.

@Manu.m -- I appreciate your input. Thanks! Edge3 (talk) 02:52, 8 July 2022 (UTC)


 * Support. As Manu.m pointed out in the edit summary, "Alternative definitions" is the wrong header name to use. But there is too much similarity between the topics to have separate articles. The content at WMAPE should be placed into a top-level section called "Weighted mean absolute percentage error". Wikiacc (¶) 02:51, 12 July 2022 (UTC)
 * ✅ Klbrain (talk) 07:37, 16 November 2022 (UTC)