Table 22 Sept 2026From “What is marketing mix modeling?”

Which operational miscalculations undermine marketing mix modeling?

Table 2Which operational miscalculations undermine marketing mix modeling?

Miscalculation	Root cause	Econometric failure	Corrective protocol
Accepting high $R^2$ as proof of causality	Overfitting dozens of regressors to limited time periods	Mistaking collinear trend-fitting for true causal elasticity	Evaluate out-of-sample prediction and holdout tests
Omitting organic demand drivers	Failing to model pricing moves, product releases, and PR events	Marketing coefficients artificially absorb baseline sales	Instrument explicit controls for price changes and macro index
Ignoring spend endogeneity	Automated ad tools spend more when sales are already surging	Regression interprets correlation as advertising persuasion	Implement instrumental variables or experimental priors
Using static adstock parameters	Forcing identical decay rates across diverse digital channels	Overestimates search longevity; underestimates brand half-life	Calibrate channel-specific decay parameters via decay audits
Operating MMM without experiments	Relying entirely on observational historical data	Model drifts into statistically confident delusion	Mandate quarterly randomized holdouts to anchor priors

Swipe or scroll horizontally if the table is wider than your screen.

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

PNG4:3, 1600 × 1200, with the title, the source line and the attribution set in the image isoglu-2026-what-is-marketing-mix-modeling-fig03.png

From the essay

From the research bench

What is marketing mix modeling?

Marketing mix modeling applies econometric regression to aggregate time-series data to estimate marketing effectiveness and optimize media budgets.

2 Sept 2026

Read the essay

This exhibit belongs to an essay: the numbers live here, the argument lives there.

Cite or embed

APA 7

Isoglu, S. (2026). Which operational miscalculations undermine marketing mix modeling? [Table]. isoglu.com. https://isoglu.com/insights/exhibits/isoglu-2026-what-is-marketing-mix-modeling-fig03/

BibTeX

@misc{isoglu-2026-what-is-marketing-mix-modeling-fig03,
  author = {Isoglu, Sinan},
  title = {{Which operational miscalculations undermine marketing mix modeling?}},
  year = {2026},
  howpublished = {Table 2, isoglu.com},
  url = {https://isoglu.com/insights/exhibits/isoglu-2026-what-is-marketing-mix-modeling-fig03/},
  note = {From the essay {What is marketing mix modeling?}}
}

Embed this exhibit

Copy this HTML to use the PNG exhibit on your site with its source line and a link back to the exhibit page.

<figure>
  <a href="https://isoglu.com/insights/exhibits/isoglu-2026-what-is-marketing-mix-modeling-fig03/">
    <img src="https://isoglu.com/social/isoglu-2026-what-is-marketing-mix-modeling-fig03.png" alt="Table 2: Which operational miscalculations undermine marketing mix modeling?" width="3200" height="2400">
  </a>
  <figcaption>Table 2: Which operational miscalculations undermine marketing mix modeling?. Source: Table from this essay. Sources and interpretation are given in the article. <a href="https://isoglu.com/insights/exhibits/isoglu-2026-what-is-marketing-mix-modeling-fig03/">View exhibit</a>.</figcaption>
</figure>