# SOCR EduMaterials AnalysisActivities TwoPairedRank

## SOCR Analysis - Two Paired Sample Signed Rank Test Example

Go to the SOCR Two Paired Sample Signed Rank Test Applet. We will demonstrate Two Paired Signed Rank Test (sometimes called Wilcoxon Signed Rank Test) with a SOCR built-in example. This example is based on a dataset from the statistical program "R." For more information of the R program, please see CRAN Home Page. The dataset used here is "shoes" under R's "MASS" library. In the dataset, ten boys are given to the wear of shoes of materials A and B for one foot. We'd like to find if one material is better than the other.

Here's the steps of the activity:

**1.** Click on **Two Paired Sample Signed Rank Test** at the left panel's combo box.

On the right panel, first click on **EXAMPLE 3** and next click on "Data" to retreive the demonstrated example. This is the example we'll be looking at.Note that the data are difference of B - A.

**2.** Click on the "**Mapping**" button to get to the "**Mapping**" panel. Click on **"ADD"** under **VARIABLE 1** to add **A** and click on **ADD** under **VARIABLE 2** to add **B**. We care about the difference, so which on goes to **VARIABLE 1** or **VARIABLE 2** is arbitrary. Here, the computer will set difference = Variable 2 - Variable 1. If you like the subtraction to go the other way around, simple assign **VARIABLE 1** and **VARIABLE 2** in the opposite way.

**3.** Click on "**Calculate**" then "**Result**" to see the results.

**Questions for students:** By looking at the test results, what do you think about the data? What can you say about the two different shoe materials?

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