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MENTAL MODEL · M9109

Control Group Principle

Control Group Principle
TechnicalmediumScientific Methodology
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Updated 2026-08-15

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INTRODUCTION

English translation pending.

CORE DEFINITION

A control group receives no treatment, or a placebo, while the experimental group receives the intervention, and the two are otherwise treated identically. Any difference between them can then be attributed to the treatment rather than to time, environment, or expectation. The qualification is that the groups must be comparable at the start, since randomisation is what makes the comparison valid.

SCAFFOLDING EFFECT

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- Use Baseline Comparison: measure both groups before the intervention so the starting points are known. - Use Confounder Control: keep every condition other than the treatment identical between the groups.

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Many things change over the same period as an intervention, including trends, seasons, and expectations. Without a comparison group, any of these can be credited to the treatment; with one, the common changes appear in both groups and cancel, leaving the treatment effect as the difference.

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Source support: Explicit

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