# SPSS On-Line Training Workshop

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# Data Reduction

In this Tutorial:

Factor Analysis

Analysis of Data

 Data Reduction procedures include Factor analysis, Correspondence Analysis and Optimal Scaling. The following movie clip demonstrates how to conduct a factor analysis.   For Correspondence Analysis and Optimal 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.

Factor Analysis enables us to do Factor Analysis. This procedure is for taking a large number of variables and reducing them into a small number of factors that explain most of the variance that is observed with the large number of variables.

 Selection variable: Allows you to limit the analysis to certain levels of a variable.

The “Factor Analysis” dialog box has the following submenus:

 Descriptives- This is chosen if you want descriptive statistics for all the chosen variables. One can also obtain the correlation matrix. Extraction- This is where you choose the method you want to use for the extraction.  Principal components (the default) is the method most often used.  You can either choose to extract eigenvalues over a specified value, or you can choose the number of  factors to extract. Rotation- You choose rotation to make the results easier to interpret.  The default rotation is none, so if you want this feature, you must choose it. Varimax is the rotation method that is most popular, although there are others. Scores- If you would like to save the scores obtained by the factor analysis, you must choose the scores subdialog box and check “Save as variables”. Options- This is chosen to control how the coefficients are displayed and how to handle missing values.