Thank you James for this.
I totally agree. I recently face PCA and very soon I fell in love with it.
In this WikiSym paper we used it to characterise editors of OpenStreetMap
based on their temporal activity patterns (eigenbehaivours):
http://opensym.org/wsos2013/proceedings/p0207-yasseri.pdf
I'm
I have long wondered why the WMF Fundraising department seems stuck on
A/B testing instead of multivariate analysis.[1] Does anyone know?
In any case, modern multivariate analysis depends on principal
component analysis[2] (PCA) and it really does work great. I have been
told for years that it is