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Modeling and Multivariate Methods - SAS

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486 Analyzing Principal Components <strong>and</strong> Reducing Dimensionality Chapter 19<br />

Platform Options<br />

Figure 19.3 3D Score Plot<br />

Switch among<br />

Principal Components,<br />

Rotated Components,<br />

Data Columns<br />

Select specific<br />

axis contents<br />

Cycle among all<br />

axis content possibilities<br />

The variables show as rays in the plot. These rays, called biplot rays, approximate the variables as a<br />

function of the principal components on the axes. If there are only two or three variables, the rays<br />

represent the variables exactly. The length of the ray corresponds to the eigenvalue or variance of the<br />

principal component.<br />

Factor Analysis performs factor-analytic style rotations of the principal components, or factor analysis.<br />

For more information, see “Factor Analysis” on page 487.<br />

Cluster Variables<br />

performs a cluster analysis on the columns, useful for grouping the columns.<br />

Save Principal Components saves the principal component to the data table, with a formula for<br />

computing the components. The formula can not evaluate rows with any missing values.<br />

Save Rotated Components saves the rotated components to the data table, with a formula for<br />

computing the components. This option appears after the Factor Analysis option is used. The formula<br />

can not evaluate rows with missing values.

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