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Effect size: how big is "works"?
Effect size: how big is "works"?: a page each for mean difference, standardised mean difference (Cohen's d), risk ratio, odds ratio and why it overstates…
This launch guide maps the topic, the source base and the practical questions. Check the linked official authority before acting on a rule, deadline, price or safety requirement.
What this guide covers
A page each for mean difference, standardised mean difference (Cohen's d), risk ratio, odds ratio and why it overstates when the outcome is common, hazard ratio, correlation r, R², and the minimal clinically important difference — the number that decides whether a real effect is worth anything. A converter turns one measure into another, and a second set of pages answers "is that a lot?" for the outcomes people meet: 2 mmHg of blood pressure, 0.4 kg over twelve weeks, eleven minutes of sleep, one point of pain.
Fourteen pages.
How to use it
Use Effect size: how big is "works"? as a structured learning path: begin with the vocabulary, follow the evidence map, and keep the uncertainty labels attached to claims as you compare sources.
The page keeps the main question, its evidence base and its limits together in one canonical place. That makes it useful as a quick orientation and avoids splitting a broad subject into shallow pages before each narrower answer has enough verified material of its own.
Search vocabulary in four languages
Terminology changes across borders. These are example phrases people use for the same subject in Estonian, Finnish, Russian and English; they are included as a practical vocabulary aid, not as hidden keywords.
| Language | Example phrase |
|---|---|
| Estonian | efekti suurus uuringus |
| Finnish | vaikutuksen koko tarkoittaa |
| Russian | размер эффекта в исследовании |
| English | cohen's d interpretation |
Evidence and provenance
The evidence map below records the primary, official or openly licensed material chosen for this guide. It is deliberately visible so a reader can tell the difference between a rule published by an authority, a measured dataset and an editorial explanation.
Source: none, computed; conversion formulas from the Cochrane Handbook v6 (free online) and Chinn 2000, cited. · checked 2026-09-09
Source names are preserved even where an authority changes its web address. No figure is added to this launch page unless it is already present in the cited source description or can be computed from a named dataset.
Scope and boundaries
This guide owns the explanatory layer for the topic. Personal decisions, diagnoses, legal determinations and live availability remain with the relevant professional or official service.
Connected TempoLife guides
The following paths are the intentional hand-offs named in the brief. They keep adjacent subjects separate while making the next useful reference easy to find.
Research
Continue to the related TempoLife reference.
Versus
Continue to the related TempoLife reference.
Why it belongs on TempoLife
/research, /versus.
Frequently asked questions
What does this guide cover?
A page each for mean difference, standardised mean difference (Cohen's d), risk ratio, odds ratio and why it overstates when the outcome is common, hazard ratio, correlation r, R², and the minimal clinically important difference — the number that decides whether a real effect is worth anything. A converter turns one measure into another, and a second set of pages answers "is that a lot?" for the outcomes people meet: 2 mmHg of blood pressure, 0.4 kg over twelve weeks, eleven minutes of sleep, one point of pain.…
What evidence does it use?
none, computed; conversion formulas from the Cochrane Handbook v6 (free online) and Chinn 2000, cited.
Where does this guide stop?
It explains the topic and points to primary or official sources. It does not replace a qualified professional, an official decision, or advice based on your own circumstances.
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