Zhang Honglu,Liu Yuanyuan,Li Changping,Hu Liangping,How to use t test correctly——comparison of two arithmetic mean values for general difference t test and SAS implementation[J].SICHUAN MENTAL HEALTH,2020,33(3):217-221

How to use t test correctly——comparison of two arithmetic mean values for general difference t test and SAS implementation

DOI：10.11886/scjsws20200526004

English keywords:Design type Quantitative data t test Arithmetic mean Difference analysis

Fund projects:国家自然科学基金项目（项目名称：贝叶斯生存分析方法在肝细胞癌肝移植患者预后预测中的应用研究，项目编号：81803333）

Author Name	Affiliation	Postcode
Zhang Honglu	Department of Epidemiology and Health Statistics, School of Public Health, Tianjin Medical University, Tianjin 300070, China	300070
Liu Yuanyuan	Department of Epidemiology and Health Statistics, School of Public Health, Tianjin Medical University, Tianjin 300070, China	300070
Li Changping	Department of Epidemiology and Health Statistics, School of Public Health, Tianjin Medical University, Tianjin 300070, China Specialty Committee of Clinical Scientific Research Statistics of World Federation of Chinese Medicine Societies, Beijing 100029, China	100029
Hu Liangping	Specialty Committee of Clinical Scientific Research Statistics of World Federation of Chinese Medicine Societies, Beijing 100029, China Graduate School, Academy of Military Sciences PLA China, Beijing 100850, China	100850

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English abstract:

The purpose of this article was to introduce the arithmetic mean, as well as the basic principle and SAS implementation of single-group design, paired design and group design unary quantitative data t test. Firstly, the concept of arithmetic mean, applicable conditions and calculation formulas were introduced. Secondly, the basic principles of t tests of different design types were introduced, combined with SAS examples for analysis, and related results were explained. Finally, discuss application considerations for different design types of t test.

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