Hello, list- Forgive me if this has been covered before- I've just joined and can't seem to find a way to browse the list archives by keyword rather than date. I'm trying to analyze a bunch of location data from lab experiments that's roughly in the form of [ObservationID,x,y,z, subjectID, treatment]
What I'd like to do is plot the cloud of observations for each fish in 3-space, subset that by treatment (or day of the trial), determine some summary stats on the enclosing polygons and the centroids for each, then calculate the distance matrix from each centroid to the others. This would be to test the hypothesis that the average subject-subject distance is less under some treatments than others. Some of this looks pretty straightforward to do in 2-space, especially if I use something like LoCoH to get the polygons, but I'm wondering if there's something canned to do it and use the z-values, too. Can someone point me in the direction of a good resource for this sort of analysis, either in R, ArcGIS, or both? Thanks, Duncan Elkins _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo