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What is the difference between generalizability, transportability, and replication?
| Decision | Source and target relationship | Evidence still needed | Honest result |
|---|---|---|---|
| Replication | Population, treatment, outcome, and context are intended to remain the same, with a new observation or sample | Repeat the source design and check whether the result recurs | The source result was reproduced or not reproduced |
| Transport | At least one target field is intentionally different | A bridge through target data, measured effect modifiers, designed variation, or a new target study | The target inference is supported, limited, or unresolved |
| Analogy | A product, market, or mechanism merely sounds similar | A matched comparison has not been supplied | A hypothesis or prior, not a transfer result |
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Reference & Evidence
Source: Table from this essay. Sources and interpretation are given in the article.
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