Currently, I am trying to perform a k-means clustering on a given dataset. If I open the configure screen - K-Means properties, some of the variables in my dataset are given in the boxes and some not. What could be reasons that some variables do not appear in the exclude or include field? Because I think I am missing some variables there (for example a binary variable).
I hope someone can explain me which variable characteristics are necessary to appear in the include/exclude fields.
Thanks in advance!