I am a beginner with R, but I have been analysing a large data set of GPS data, made up of unique individuals (name) (approx 100 unique names) with 1,000,000+ lines of data. Each unique name has varying number of coordinates (lat and lng) each. Each unique name belongs to either group a or b. I have so far done a polygon point count analysis to analyse use of the site between groups a and b. I want to do a hierarchical cluster analysis within each group a and group b to analysis interactions within each group, and then between groups a and b.