[Wiki-research-l] Principal component analysis for multivariate testing

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

Re: [Wiki-research-l] Principal component analysis for multivariate testing

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