Distances | Compute Net Between Groups Means
This command computes the net average distances between groups of taxa. The net average distance between two groups is given by
dA = dXY ((dX + dY)/2)
Where, dXY is the average distance between groups X and Y, and dX and dY are the mean within-group distances. A Select Distance Options dialog, in which you can choose the desired distance estimation method and other relevant options, will appear.
You must have at least two groups of taxa with a minimum of two taxa each for this option to work.