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MENTAL MODEL · M1986

Mendelian Randomization

Mendelian Randomization
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

A method that uses genetic variants as instrumental variables to infer causal relationships between exposures (e.g., alcohol consumption) and outcomes (e.g., heart disease). It is referred to as a "natural randomized controlled trial."

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

To find causality when experiments are impossible. When ethics or conditions do not allow human experiments (e.g., forcing people to smoke), using nature's random assignment (genes) is a powerful tool for obtaining causal evidence.

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Anchor fast decisions

Using genetic variants randomly assigned at birth as instrumental variables, since genes are randomly allocated at conception and are not affected by post-natal confounding, this approximates a natural RCT, inferring causality between exposure (e.g., alcohol consumption) and outcome (e.g., heart disease), avoiding reverse causation and confounding.

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Mendelian_randomizationZH · Explicit
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