In the example, we are going to use clustering to drag the cluster pill from the sheet into the data pane on the left. You can treat the resulting field as a group. In your visualizations, Tableau will treat the cluster field like any other visualization.
These include standardization of inputs that automatically scale the data and multiple correspondence analyses (if you're curious about the details, you can find out more about the math behind clustering in product documentation at http://onlinehelp.tableau.com/v10.0/pro/desktop/en-us/help.html#clustering.html).
This means you can work with many different types of data with minimal preparation. You can include categorical fields such as
level in your clustering analysis alongside numeric variables such as
income without worries or use it for clustering survey responses where all inputs could be categorical.