Table 51 Sept 2026From “Forecast accuracy can hide offsetting errors”

The row-level forecast-error audit

Table 5The row-level forecast-error audit

Audit field	Required question	Failure if omitted
Forecast object	What exactly was forecast: units, revenue, opportunities, capacity, or something else?	Unlike rows are silently combined
Baseline and final forecast	Was an intervention applied, and what was the untouched value?	FVA and override effects cannot be separated
Actual outcome	What event closed the forecast window?	Error is calculated against a moving target
Signed error	Which direction convention is in force?	Bias changes sign or becomes uninterpretable
Absolute or squared error	How large was the miss regardless of direction?	Cancellation is mistaken for accuracy
Horizon	How far ahead was the forecast issued?	Short and long forecasts are treated as identical
Denominator	What base creates the percentage comparison?	Ratios change without a visible measurement change
Segment and tail flag	Which rows create persistent or severe errors?	Aggregate averages erase the operational problem
Decision cost	What does an over- or underforecast make the organization do?	Metric improvement is mistaken for decision value

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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). The row-level forecast-error audit [Table]. isoglu.com. https://isoglu.com/insights/exhibits/isoglu-2026-forecast-accuracy-can-hide-offsetting-errors-fig05/

BibTeX

@misc{isoglu-2026-forecast-accuracy-can-hide-offsetting-errors-fig05,
  author = {Isoglu, Sinan},
  title = {{The row-level forecast-error audit}},
  year = {2026},
  howpublished = {Table 5, isoglu.com},
  url = {https://isoglu.com/insights/exhibits/isoglu-2026-forecast-accuracy-can-hide-offsetting-errors-fig05/},
  note = {From the essay {Forecast accuracy can hide offsetting errors}}
}

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  <a href="https://isoglu.com/insights/exhibits/isoglu-2026-forecast-accuracy-can-hide-offsetting-errors-fig05/">
    <img src="https://isoglu.com/social/isoglu-2026-forecast-accuracy-can-hide-offsetting-errors-fig05.png" alt="Table 5: The row-level forecast-error audit" width="3200" height="2400">
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  <figcaption>Table 5: The row-level forecast-error audit. 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-fig05/">View exhibit</a>.</figcaption>
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