Example: A sample of n persons have been asked about their sympathy for m countries
(’Here is a list of m countries. Can you select those countries you like?’). If a researcher wants
to analyse the question ’which countries are similar?’ he will cluster variables and he must
apply agglomerative hierarchical techniques (or other techniques for clustering variables).
If the question is ’do the persons differ in their sympathy and can different patterns of
preferences be identified?’ cases are clustered. For this purpose, all three methods