SOCR EduMaterials AnalysisActivities TwoPairedSign

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Two Paired Sample Sign Test Example

We will demonstrate Two Paired Sign 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 Sign Test at the left panel's combo box.

SOCR AnalysisActivities TwoPairedSign Chu 051707 Fig1.gif


SOCR AnalysisActivities TwoPairedSign Chu 051707 Fig1A.gif


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.

SOCR AnalysisActivities TwoPairedSign Chu 051707 Fig2.gif


2. Click on the "Mapping" button to get to the "Mapping" panel. Click on "ADD" under VARIABLE 1 and to VARIABLE 2 add the variables for Two Paired Sample T-Test. We care about the difference, so which on goes to VARIABLE 1 is arbitrary. You can just add column A to VARIABLE 1 and B to VARIABLE 2. Here, the computer will set difference = Variable 2 - Variable 1. If you like the substraction to go the other way around, simple assign VARIABLE 1 and VARIABLE 2 in a different way.


SOCR AnalysisActivities TwoPairedSign Chu 051707 Fig3.gif


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


SOCR AnalysisActivities TwoPairedSign Chu 051707 Fig4.gif


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?