While I was working up some other notes, I checked Mann’s reference to a presentation by Jolliffe, supposedly justifying de-centered uncentered principal components analysis. (It doesn’t, but that’s for another day.) Anyway, the hyperlink has disappeared. Chasing up the directory chain, the Jolliffe presentation had been previously stored by the Climate Systems Analysis Group of the University of Cape Town, a climatology group who described themselves as follows:
We are a dynamic group of coffee drinkers…. but, hopefully, we also produce some worthwhile information every now and again
Sorry, but I couldn’t resist.