| Yu Zeyang,Liu Yuanyuan,Li Changping,Hu Liangping,How to use t test correctly——comparison of two geometric means with general difference t test and SAS implementation[J].SICHUAN MENTAL HEALTH,2020,33(3):222-225 |
| How to use t test correctly——comparison of two geometric means with general difference t test and SAS implementation |
DOI：10.11886/scjsws20200526005 |
| English keywords:Geometric mean Logarithmic normal distribution Variable transformation t test SAS software |
| 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 | | Yu Zeyang | Department of Health Statistics, School of Public Health, Tianjin Medical University, Tianjin 300070, China | 300070 | | Liu Yuanyuan | Department of Health Statistics, School of Public Health, Tianjin Medical University, Tianjin 300070, China | 300070 | | Li Changping | Department of 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 |
|
| Hits: |
| Download times: |
| English abstract: |
| The purpose of this article was to introduce the geometric mean, as well as the SAS implementation of general difference t test for logarithmic normal distribution data. Firstly, the concept of geometric mean, applicable conditions and calculation formulas were introduced. And the characteristics of geometric means were compared with those of arithmetic means commonly used in statistics. Secondly, two groups of concentration data were presented, which were logarithmic normal distribution approximately and met the applicable conditions of the geometric mean. The TTEST procedure of SAS was used to perform a t test on the general difference of the geometric mean. The relevant results were explained and compared. Finally, the precautions when using geometric mean were discussed. |
| View Full Text
View/Add Comment Download reader |
| Close |
|
|
|