In chi-squared tests, the conventional and conservative rule - known as the rule of five - is to require that difference between the observed and expected frequency for each cell be at least 5.

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The rule of five in chi-squared tests actually states that no more than 20% of the cells should have expected frequencies less than 5, and all individual expected frequencies should be 1 or greater.

In Chi-Squared Tests, the Conventional and Conservative Rule - Known