Hu Chunyan,Hu Liangping,How to use χ² test correctly—— χ² test for the data of four-fold tables collected from the cohort design[J].SICHUAN MENTAL HEALTH,2021,34(1):53-57

How to use χ² test correctly—— χ² test for the data of four-fold tables collected from the cohort design

DOI：10.11886/scjsws20210115005

English keywords:Cohort design χ²test Relative risk Confidence interval SAS software R software

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Author Name	Affiliation	Postcode
Hu Chunyan	Graduate School， Academy of Military Sciences PLA China， Beijing 100850， China	100850
Hu Liangping	Graduate School， Academy of Military Sciences PLA China， Beijing 100850， China Specialty Committee of Clinical Scientific Research Statistics of World Federation of Chinese Medicine Societies， Beijing 100029， China	100029

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English abstract:

The purpose of this paper was to introduce the χ² test for the data of four-fold tables collected from the cohort design， the hypothesis test and interval estimation of relative risk， and the implementation of SAS and R software. In view of the characteristics of cohort design， the concept of relative risk， hypothesis testing and interval estimation were emphasized. It was given that the interpretation of the results calculated by SAS and R software， as well as the statistical and professional conclusions.

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