# What is the Wilcoxon Sign Test?

The Wilcoxon Signed Rank test is a non-parametric analysis that statistically compared of the average of two dependent samples and assess for significant differences.

The Wilcoxon sign test is the non-parametric alternative of the dependent samples t-test.

**Conduct Your Wilcoxon Signed Rank Test Now!**

*Fill out the form above, and start using Intellectus Statistics for FREE*

*!*

**Questions Answered:**

Are test scores different from 4^{th} grade to 5^{th} grade on the same students?

Does a particular diet drug have an effect on BMI when tested one the same individuals?

**Assumptions:**

Data comes from two matched, or dependent, populations.

The data is continuous.

Because it is a non-parametric test it does not require a special distribution of the dependent variable in the analysis.

The Wilcoxon Sign test is a repeated measures test of dependency. This test is mathematically similar to conducting a Mann-Whitney U-test (which is sometimes also called Wilcoxon 2-sample t-test). It is also similar to the basic principle of the dependent samples t-test, because just like the dependent samples t-test the Wilcoxon sign test, tests the difference of observations when the observations are matched.

However this test pools all differences, ranks them and applies a negative sign to all the ranks where the difference between the two observations is negative. This is called the signed rank.. Whereas the dependent samples t-test tests whether the average difference between two observations is 0 the Wilcoxon test tests whether the difference between two observations has a mean signed rank of 0. Thus it is much more robust against outliers and heavy tail distributions. . Thus it is the best test to compare mean scores when the dependent variable is not normally distributed.

**Statistics Solutions can assist with your quantitative analysis by assisting you to develop your methodology and results chapters. **The services that we offer include:

- Edit your research questions and null/alternative hypotheses
- Write your data analysis plan; specify specific statistics to address the research questions, the assumptions of the statistics, and justify why they are the appropriate statistics; provide references
- Justify your sample size/power analysis, provide references
- Explain your data analysis plan to you so you are comfortable and confident
- Two hours of additional support with your statistician

*Quantitative Results Section** (Descriptive Statistics, Bivariate and Multivariate Analyses, Structural Equation Modeling, Path analysis, HLM, Cluster Analysis)*

- Clean and code dataset
- Conduct descriptive statistics (i.e., mean, standard deviation, frequency and percent, as appropriate)
- Conduct analyses to examine each of your research questions
- Write-up results
- Provide APA 6
^{th}edition tables and figures - Explain chapter 4 findings
- Ongoing support for entire results chapter statistics

**Please call 877-437-8622 to request a quote based on the specifics of your research, or email **Info@StatisticsSolutions.com**.*

Related Pages:

Conduct and Interpret a Wilcoxon Sign Test

Assumptions of the Wilcoxon Sign Test

How to Conduct the Wilcoxon Sign Test