"The Currier languages revisited" revisited

[Jorge_Stolfi]

All theoretically possible, but this is not what we are looking at here.  To be on the safe side I created plots involving six different 'base' vectors, which showed nothing of interest - just the cloud getting narrower and narrower.

That is what I did too, back in the day.   

We now have mappings to N-space and projections to 2-space that show the A and B pages neatly separated by a hyperplane, except for one or two special cases.  That is good.  My quibble is just that there may be other magical projections that show equally neat separation between some pair of sections with the same language, like Herbal-B from Pharma.  Even if there is such a projection, PCA is not guaranteed to find it, even if we give it just those two sections.  The centroid-to-centroid vector will not necessarily work either.

All the best, --stolfi