Atomistic Fallacy
Updated 2026-08-11
INTRODUCTION
English translation pending.
CORE DEFINITION
The mirror image of the ecological fallacy. The atomistic fallacy occurs when a relationship observed among individuals is assumed to hold at the group or population level, without aggregating. A smoker who lives to ninety does not show that smoking is harmless, because individual survival says nothing about population rates. Valid group-level conclusions require group-level data, since relationships can change or reverse under aggregation.
SCAFFOLDING EFFECT
Reduce cognitive load
- Check the level: ask whether the data and the conclusion are at the same level of aggregation - Discount anecdotes: treat a single case as evidence about a case, not about a population - Aggregate before concluding: use group-level data to support group-level claims about groups
Anchor fast decisions
Individual outcomes are produced by many factors acting together, so a single case cannot isolate any one of them. At the population level, effects that are invisible or reversed within individuals can dominate, which is why the two levels can point in different directions. Reasoning from one level to the other without aggregation therefore replaces a rate with a story.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- pubmed.ncbi.nlm.nih.govhttps://pubmed.ncbi.nlm.nih.gov/11103669/verified
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