Search results with tag "The wilcoxon rank sum test"
14.1 The Wilcoxon Rank Sum Test - University of Florida
users.stat.ufl.edu14.1 The Wilcoxon Rank Sum Test 1 2 12 1 12 5 This test was invented by Frank Wilcoxon (1892–1965) in 1945. Wilcoxon was a chemist who met statistical problems in his work at the research laboratories of American Cyanimid Company. The Wilcoxon rank sum test The Wilcoxon Rank Sum Test
Title stata.com ranksum — Equality tests on unmatched data
www.stata.comFor the Wilcoxon rank-sum test, there are two independent random variables, X 1 and X 2, and we test the null hypothesis that X 1 ˘X 2. We have a sample of size n 1 from X 1 and another of size n 2 from X 2. The data are then ranked without regard to the sample to which they belong. If the data are tied,
Syntax - Stata
www.stata.comFor the Wilcoxon rank-sum test, there are two independent random variables, X 1 and X 2, and we test the null hypothesis that X 1 ˘X 2. We have a sample of size n 1 from X 1 and another of size n 2 from X 2. The data are then ranked without regard to the sample to which they belong. If the data are tied, averaged ranks are used.
Statistics: 2.3 The Mann-Whitney U Test - statstutor
www.statstutor.ac.ukNote that the Mann-Whitney U test is statistically equivalent to the Wilcoxon rank sum test (not to be confused with the Wilcoxon signed rank sum test, which is for paired data). Example: The following data shows the age at diagnosis of type II diabetes in young adults. Is the age at diagnosis different for males and females? Males: 19 22 16 29 24
The Wilcoxon Rank-Sum Test - Auckland
www.stat.auckland.ac.nzThe Wilcoxon Rank-Sum Test The Wilcoxon rank-sum test is a nonparametric alternative to the two-sample t-test which is based solely on the order in which the observations from the two samples fall. We will use the following as a running example. Example 1 In a genetic inheritance study discussed by Margolin [1988],