Volume 14, Number 3 (3-2016)                   ijdld 2016, 14(3): 145-162 | Back to browse issues page


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Asghari Jafarabadi M, Mohammadi M. STATISTICAL SERIES: COMMON NON-PARAMETRIC METHODS . ijdld. 2016; 14 (3) :145-162
URL: http://ijdld.tums.ac.ir/article-1-5364-en.html

1- 1. Medical Education Research Center, Department of Statistics and Epidemiology, Faculty of Health, Tabriz University of Medical Sciences, Tabriz, Iran , asgharimo@tbzmed.ac.ir
2- 2. Department of Anatomical Sciences, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
Abstract:   (2990 Views)

There are situations in medical studies, wherein it is impossible to use the methods based on normal distribution (parametric methods). This paper objects to introduce common nonparametric methods and the inferences based on the methods in medical studies. Principles and method of calculations along with the software codes for common nonparametric methods and inference based on them were presented taking into account the considerations relevant to choose the nonparametric methods and their relative efficiency with examples in medical studies. In the situation where the assumptions are not satisfied, the nonparametric methods should be used without caution to lose the efficiency or even with higher efficiency of these methods. To compare a non-normal or ordinal variable between two groups Mann-Whitney test, to compare a non-normal or ordinal variable among more than two groups Kruskal-Wallis test, to compare a non-normal variable between two related situations or matched groups Wilcoxon test and to compare an ordinal variable between two related situations or matched groups Sign test should be used. In each of these tests the results of research based examples were presented along with the methods of their calculations. To assess the relation or difference in all types of medical studies, these tests are recommended considering the situation and purpose of study.

Full-Text [PDF 430 kb]   (3936 Downloads)    
Type of Study: Review | Subject: General
Received: 2015/06/22 | Accepted: 2015/06/22 | Published: 2015/06/22

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