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Modeling and Multivariate Methods - SAS

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Chapter 19<br />

Analyzing Principal Components <strong>and</strong> Reducing<br />

Dimensionality<br />

Using the Principal Components Platform<br />

The purpose of principal component analysis is to derive a small number of independent linear<br />

combinations (principal components) of a set of variables that capture as much of the variability in the<br />

original variables as possible.<br />

JMP also offers several types of orthogonal <strong>and</strong> oblique Factor-Analysis-Style rotations to help interpret the<br />

extracted components. The platform also supports factor analysis.<br />

Principal components can be accessed through the <strong>Multivariate</strong> platform, through the Scatterplot 3D<br />

platform, or through the Principal Components comm<strong>and</strong> on the Analyze > <strong>Multivariate</strong> <strong>Methods</strong><br />

menu. All map to the same routines, documented in this chapter.<br />

Figure 19.1 Example of Principal Components

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