Workspace Node: Principal Components and Classification Analysis - Results - Cases Tab

In the Principal Components and Classification Analysis node dialog box, under the Results heading, select the Cases tab to access the following options.

Element Name Description
Factor coordinates of cases Select this check box to produce a spreadsheet with factor coordinates of cases. The spreadsheet will also contain:

1) an additional column displaying the code for active and supplementary cases, if a Variable for active cases was selected via the Variables button on the Specifications - Quick tab;

2) an additional column (last), displaying the label defined by the grouping variable, if a Grouping variable was selected via the Variables button on the Specifications - Quick tab.

Note: the spreadsheet will display the factor coordinates only for the complete (valid) cases, if the Casewise option button was selected in the MD deletion group box on the Specifications - Quick tab. Alternatively, if Mean substitution was selected, the mean of the corresponding variable will be used in place of missing data and the spreadsheet will contain the factor coordinates for all cases. The Number of factors (see the Results - Quick tab) selected for the current analysis will determine the number of factors for which the coordinates will be computed and displayed. Note that the estimates of means and standard deviations that are used in the computation of factor coordinates of cases are computed from all valid cases, both active and supplementary. Refer to the Introductory Overview for additional details.
Plot case factor coordinates, 2D Select this check box to produce a 2D scatterplot of the factor coordinates for the cases. The plot will contain coordinates for the supplementary cases, provided a Variable for active cases was selected and a valid Code for active cases was chosen on the Specifications - Quick tab. Click the adjacent button to display the Select Two Factors for the Plot dialog box, where you can select factors for the factor axes.
Options for plot of factor coord The options in this group box pertain to the plot of the factor coordinates of cases (see Plot factor coordinates, 2D above). By default, when the input data file contains case names, the Case names option button will be selected and the cases will be labeled in the scatterplot by their respective case names. If the input data file does not contain case names, the Case numbers option button will be the default. If you select the No names/numbers option button, cases will be displayed only as points in the scatterplot, without their names or numbers. The Grouping labels option button is used to label the cases, provided the grouping variable was selected for the analysis. This option is often useful to identify and label the clusters of cases. Finally, if you want to project only those cases onto the factor plane for which the sum of cosine squares for the selected pair of factors is greater than a certain quantity C (0<=C<=1), enter this value in the edit field Plot cases with sum of cosine2 >=. Note that the Plot cases with sum of cosine2 >= field works in conjunction with the Number of factors option on the Results - Quick tab.
Case names Select this option button to display the names of cases for which the factor coordinates will be plotted.
Case numbers Select this option button to display the case numbers instead of the case names. You may prefer to display the case numbers in the plot of factor coordinates if the case names are too long or the number of cases is too large.
No names/numbers Select this option button to plot the case factor coordinates just as points, without the case names or numbers.
Grouping labels Select this option button to display the label for each case coordinate. Such labels are defined by the Grouping variable, which can be selected via the Variables button on the Specifications - Quick tab. This option will, therefore, only be available if a grouping variable is selected.
Factor scores Select this check box to produce a spreadsheet with factor scores. The spreadsheet may also contain:
  1. an additional column displaying the code for active and supplementary cases, if a Variable for active cases was selected via the Variables button on the Specifications - Quick tab;
  2. an additional column (last), displaying the label defined by the grouping variable, if a Grouping variable was selected via the Variables button on the Specifications - Quick tab.
Note: the spreadsheet will display the factor scores only for the complete (valid) cases if the Casewise option button is selected in the MD deletion group box on the Specifications - Quick tab. Alternatively, if Mean substitution was selected, the spreadsheet will show zeros for the missing data cases. The Number of factors (see the Results - Quick tab) selected for the current analysis will determine the number of factors for which the coordinates will be computed and displayed. Note that the estimates of means and standard deviations that are used in the computation of factor scores are computed from all valid cases, both active and supplementary. Refer to the Introductory Overview for additional details.
Factor score coefficients Select this check box to produce a spreadsheet with the factor score coefficients.
Contributions of cases Select this check box to produce a spreadsheet with contributions of active cases to the variances, based on the first factor, first two factors, and so on. The contributions shown in the last column of this spreadsheet are the contributions computed from the current Number of factors (see the Results - Quick tab).
Cosine2 Select this check box to produce a spreadsheet with the cosine squares of the angle formed by the vector radius of each point and the factor axes. The values in this spreadsheet represent the relative contribution of the factor axes to the eccentricity of each case (see Introductory Overview). This spreadsheet will also supply information as to whether a particular case is an active or supplementary case. Each case will also be labeled, if you have selected a Grouping variable via the Variables button on the Specifications - Quick tab. Note that in case of Casewise deletion of missing values (specified via the MD deletion group box on the Specifications - Quick tab), the Cosine2 values for the missing data will not be available. Refer to the Introductory Overview for additional details.

Options / C. See Common Options.

OK Click the OK button to accept all the specifications made in the dialog box and to close it. The analysis results will be placed in the Reporting Documents node after running (updating) the project.