Hu Chunyan,Hu Liangping,How to use χ² test correctly—— χ² tests for the data collected from the two kinds of two dimensional contingency tables with an ordinal variable in one direction[J].SICHUAN MENTAL HEALTH,2021,34(2):116-120

How to use χ² test correctly—— χ² tests for the data collected from the two kinds of two dimensional contingency tables with an ordinal variable in one direction

DOI：10.11886/scjsws20210316004

English keywords:Two-dimensional contingency table Linear trend test χ² test 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 linear trend χ² tests for the data of the two kinds of one-way ordinal two-dimensional contingency tables and the implementation of SAS and R software. The two one-way ordered two-dimensional contingency tables referred to the “R×2 contingency table” with R values ordinal variable as the cause variable and the “2×C contingency table”with C values ordinal variable as the outcome variable. Their linear trend tests required the use of the Cochran-Armitage’s linear trend χ² test and the Lee’s linear trend χ² test， respectively.

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