---
title: The Fisher's test
description: "\"The Fisher\\xE2\\x80\\x99s test is used to compare two proportions from two independent groups. \""
---

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# The Fisher's test

# Definition

The Fisher’s test is used to **compare two proportions** from two independent groups. It helps to conclude if there seems to be an association between two factors or two diseases or a factor and a disease. It is used when the Chi² test cannot be performed because of too small samples.

# In practice

If there is **less than 5 patients for at least one case** of a contingency table, as : 

- **Tobacco / COPD** : Smoker — **COPD positive** : 50 — **COPD negative** : 2
- **Tobacco / COPD** : No smoker — **COPD positive** : 5 — **COPD negative** : 50

The Chi² test will be replaced by the Fisher's test.

# How to use it on EasyMedStat ?

1. Go to Statistics \> Test variables
2. Select a first variable which could be of types Yes-no or List
3. Select a second variable which could be of types Yes-no or List
4. Click on "Find a statistical association between ..."

If your samples are large enough, a [chi-squared test](https://help.easymedstat.com/support/solutions/articles/77000356203-the-chi-test?hsLang=en) will be performed automatically.

# See also

- <https://help.easymedstat.com/support/solutions/articles/77000408441-analysis-of-variance-anova-?hsLang=en>[The Chi² test](https://help.easymedstat.com/support/solutions/articles/77000356203-the-chi-test?hsLang=en)
- [The McNemar's test](https://help.easymedstat.com/support/solutions/articles/77000401688-the-mcnemar-s-test?hsLang=en)
- [Paired data](https://help.easymedstat.com/support/solutions/articles/77000401292-paired-data?hsLang=en)

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