Statnote 7: chi-square contingency tables

Anthony Hilton, Richard A. Armstrong

Research output: Contribution to specialist publication or newspaperArticle


When the data are counts or the frequencies of particular events and can be expressed as a contingency table, then they can be analysed using the chi-square distribution. When applied to a 2 x 2 table, the test is approximate and care needs to be taken in analysing tables when the expected frequencies are small either by applying Yate’s correction or by using Fisher’s exact test. Larger contingency tables can also be analysed using this method. Note that it is a serious statistical error to use any of these tests on measurement data!
Original languageEnglish
Number of pages2
Specialist publicationMicrobiologist
Publication statusPublished - Dec 2006


  • contingency table
  • chi-square distribution


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