Table 31 Sept 2026From “Forecast accuracy can hide offsetting errors”

One word called accuracy hides several measures

Table 3One word called accuracy hides several measures

Object	What it answers	What it can hide
Mean signed error	Is the selected set directionally high or low?	Opposite errors and the size of each miss
Mean absolute error	How large is the typical miss in the selected unit?	Whether errors are high or low
Root mean squared error	How strongly do large misses affect the summary?	The reason for an extreme miss and the ordinary case
Median absolute error	What is the middle miss after magnitude is taken?	A small number of severe tail errors
Quantiles or tail shares	How is error distributed across cases?	The causal reason for the distribution
Error by horizon or segment	Where does the process behave differently?	The aggregate average across unlike objects

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Source: Table from this essay. Sources and interpretation are given in the article.

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From the essay

Revenue operations & AI

Forecast accuracy can hide offsetting errors

A forecast can be unbiased on average while missing every period: keep signed error, absolute error, distribution, horizon, and decision cost separate.

1 Sept 2026

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Isoglu, S. (2026). One word called accuracy hides several measures [Table]. isoglu.com. https://isoglu.com/insights/exhibits/isoglu-2026-forecast-accuracy-can-hide-offsetting-errors-fig03/

BibTeX

@misc{isoglu-2026-forecast-accuracy-can-hide-offsetting-errors-fig03,
  author = {Isoglu, Sinan},
  title = {{One word called accuracy hides several measures}},
  year = {2026},
  howpublished = {Table 3, isoglu.com},
  url = {https://isoglu.com/insights/exhibits/isoglu-2026-forecast-accuracy-can-hide-offsetting-errors-fig03/},
  note = {From the essay {Forecast accuracy can hide offsetting errors}}
}

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  <figcaption>Table 3: One word called accuracy hides several measures. Source: Table from this essay. Sources and interpretation are given in the article. <a href="https://isoglu.com/insights/exhibits/isoglu-2026-forecast-accuracy-can-hide-offsetting-errors-fig03/">View exhibit</a>.</figcaption>
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