Dear all,

I'm new to clusters analysis and I have to plan one in order to identify 2 groups of patients who show responsiveness (or not) to a treatment.

I had a look on SAS documentation related to Proc Cluster (114 pages!) but I'm quite bothered because there are many distances which are proposed. I don't know which strategy I should plan: I think the best would be to choose the distance leading to the grouping which best fits with my responsiveness criterion. But this means that I'd have to identify clusters resulting to each distance and test association with my responsiveness criterion each time.

Do you know which distances are the most currently used ?

Thanks in advance,

Catherine.