Use this field to specify the character or numeric variables for which to construct principal components . Each distinct level of these class variables is used to construct a numerical column of 0s and 1s in the analysis.Caution : Specifying a very large number of variables or using a data set with a large number of variables can prohibitively increase the time needed to run this process.All of the variables in the input data set are displayed in the Available Variables field.
Highlight one or more variables. To highlight multiple variables at once, hold down while left-clicking on them.
Click to add the highlighted variable(s) to the Class Variables field, as shown below: