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Author Question: Differentiate between the Wilcoxon signed rank test and the Wilcoxon rank sum test, and explain the ... (Read 344 times)

strangeaffliction

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on: Jun 24, 2018
Differentiate between the Wilcoxon signed rank test and the Wilcoxon rank sum test, and explain the circumstances under which each should be applied.

Question 2

What is the parametric counterpart to the Wilcoxon signed rank test for paired samples? Compare the assumptions involved in using the respective tests.


flannelavenger

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Reply #1 on: Jun 24, 2018
Answer to Question 1

The Wilcoxon rank sum test compares two independent samples, while the Wilcoxon signed rank test can be used to compare two dependent samples. The Wilcoxon rank sum test should be used with independent samples, and the signed rank test should be used when dealing with pairs.

Answer to Question 2

The parametric counterpart to the Wilcoxon signed rank test for paired samples is the paired samples t-test. Both tests assume continuous data on the interval or ratio scale, and the data come in pairs. The t-test assumes that both underlying populations are normally distributed, whereas the Wilcoxon test assumes only that both distributions are fairly symmetric in shape.


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