# SPSS On-Line Training Workshop

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# Reliability Analysis

In this Tutorial:

scale

Analysis of Data

 Reliability procedures include Reliability Analysis and Multidimensional Scaling techniques. The following movie clip demonstrates how to conduct a reliability analysis. For Multidimensional Unfolding and Multidimensional Scaling, one may refer to the SPSS Help Menu for additional information.

In this on-line workshop, you will find many movie clips. Each movie clip will demonstrate some specific usage of SPSS.

Reliability Analysis: This measures the overall consistency of the items that are used to define a scale. As a result, we are given sample size, number of items and reliability coefficients.

Model- Alpha (Cronbach) is the most popular.  However there are others and the help menu can tell you in what situations each is used.

The “Reliability Analysis” dialog box has one submenu.

Statistics: This will give us additional statistics, such as

 Descriptives for scale if item deleted- Helps us to see if deleting an item will improve our reliability. Descriptives for scale- Give you descriptives on the items, as a group. Inter-item correlation- Give the correlations between the items.

The data set used for demonstrating the reliability analysis is the Tech Survey data set. See Data Set page for details. The variables of interest are Q31a1 through Q31a12. These variables deal with the level of difficulty of faculty in using technology in the classroom. These questions are rated on a scale of 1 to 5, where 1 is the least difficult to use and 5 is the most difficult to use. Our scale will be the average of these 12 questions.

Multidimensional Scaling is a technique for finding pattern in a data set using a distance measure among cases. One should refer to the SPSS Help menu for additional information.

This online SPSS Training Workshop is developed by Dr Carl Lee, Dr Felix Famoye , student assistants Barbara Shelden and Albert Brown , Department of Mathematics, Central Michigan  University. All rights reserved.