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What is the difference between a Chi-square test and Fishers exact test?

April 26, 2017Chi-square exact fishers Test

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What is the difference between a Chi-square test and Fishers exact test?

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Both test the association between two categorical variables. The difference is that the Chi-square test requires the expected cell counts in the crosstabulation of these two categorical variables to be larger than 5. When this assumption fails Fisher’s exact test is recommended.