No, there no any meaning binded on axes of the graphs, there only a plane line of the points ordered by hops, or by inbound/outboud or by their difference, that line is packed into a quare for better viewable shape.

Yes, this rather should be taking as an hypothesis rather as a proven statement and it’s a subject for further examination. In outline: the Neo PopRank is depends not only on inbound links and rank of referees, but also on outbond links and rank of references and something like backpropagation training for neural network is used to recalculate the rank.

on the graphs, what is x and what is y? One is “Hops” and the other inbound/outbound or their difference?

“the rating of popularity (Popularity Rank) usually higher for pages with the number of inbound links is relatively high, but also higher than the number of outbound links. And conversely, if the page has more outbound links than inbound, her popularity rating will be usually below.”

Well, PageRank says the same, but on a per Page level and not like yours that seems to put heavy value on the Website Homepage.

I don’t see how this is more robust against linking spam, please elaborate.

Thanks