Table 36 Sept 2026From “What is external validity? A result needs a transfer boundary”

What does a transfer matrix look like?

Table 3What does a transfer matrix look like?

ID	Source or target object	Treatment and comparator	Outcome and window	Context	Changed field	Verdict
S-01	US self-serve SMB trial accounts	Email onboarding versus holdout	First report exported by day 14	US self-serve, synthetic source setting	None	Source result: +8 percentage points, illustrative only
R-01	New sample from the same US self-serve SMB target	Same email onboarding versus holdout	Same first-report event by day 14	Same source setting	None intended	Replication candidate; repeat the source design
T-01	US enterprise accounts	Same email onboarding versus holdout	Same first-report event by day 14	Same source setting	Population	Do not transport without target population evidence
T-02	Same US self-serve SMB accounts	Sales-led implementation versus holdout	Same first-report event by day 14	Same source setting	Treatment	New treatment question; source effect does not identify it
T-03	Same US self-serve SMB accounts	Same email onboarding versus holdout	90-day renewal	Same source setting	Outcome and time	New outcome question; activation result does not identify renewal
T-04	Same customer profile in a DACH operating context	Same email onboarding versus holdout	Same first-report event by day 14	Different regulatory and operating context	Context	Context bridge and target evidence required

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

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From the essay

From the research bench

What is external validity? A result needs a transfer boundary

External validity asks whether a result transfers across a named population, treatment, outcome, and context. Name the target before generalizing.

6 Sept 2026

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APA 7

Isoglu, S. (2026). What does a transfer matrix look like? [Table]. isoglu.com. https://isoglu.com/insights/exhibits/isoglu-2026-what-is-external-validity-fig04/

BibTeX

@misc{isoglu-2026-what-is-external-validity-fig04,
  author = {Isoglu, Sinan},
  title = {{What does a transfer matrix look like?}},
  year = {2026},
  howpublished = {Table 3, isoglu.com},
  url = {https://isoglu.com/insights/exhibits/isoglu-2026-what-is-external-validity-fig04/},
  note = {From the essay {What is external validity? A result needs a transfer boundary}}
}

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  <a href="https://isoglu.com/insights/exhibits/isoglu-2026-what-is-external-validity-fig04/">
    <img src="https://isoglu.com/social/isoglu-2026-what-is-external-validity-fig04.png" alt="Table 3: What does a transfer matrix look like?" width="3200" height="2400">
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  <figcaption>Table 3: What does a transfer matrix look like?. Source: Table from this essay. Sources and interpretation are given in the article. <a href="https://isoglu.com/insights/exhibits/isoglu-2026-what-is-external-validity-fig04/">View exhibit</a>.</figcaption>
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