Use this field to specify a variable whose values can, either singly or in combination, provide a unique identifier for each row. This variable is used to generate names for the distance variables and is copied to the output data set.The maximum length of the combined Prefix + ID variables is 32 characters minus the number of rows in the data set. If the form of the input data is already a distance matrix , this ID variable is used to label the cluster Dendrogram .All of the variables in the input data set are displayed in the Available Variables field.
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Clickto add the highlighted variable to the ID Variable field, as shown below: