The MVPMODEL Procedure
ID variables ;
The first variable that is specified in the ID statement is used to label observations in score plots for principal components. If you do not specify an ID statement, then score plot points are labeled with their observation numbers.
The values of all ID variables are displayed in tooltips when you create HTML output and specify the IMAGEMAP option in the ODS GRAPHICS statement. See Chapter 21: Statistical Graphics Using ODS in SAS/STAT User's Guide, for details.