tedster - 6:58 pm on Nov 2, 2012 (gmt 0)
The original comment was in an interview by Eric Enge - [webmasterworld.com...]
Eric Enge: Let's say you move from one domain to another... is there some loss in PageRank that can take place simply because the user who originally implemented a link to the site didn't link to it on the new domain?
Matt Cutts: I am not 100 percent sure whether the crawling and indexing team has implemented that sort of natural PageRank decay, so I will have to go and check on that specific case. (Note: in a follow on email, Matt confirmed that this is in fact the case. There is some loss of PR through a 301). [my emphasis]
As I remember, the 10% to 15% number came in a video that was published slightly later. Because video content is hard to research I haven't come up with that one so far - will post it if I can find it.