How Google's Rankings Algorithm Has Changed Over Time

wensing · on April 9, 2009

Could someone shed some light on the "domain authority" piece? Any clue as to how this is determined, speaking qualitatively or quantitatively?

The part about 'links as votes' being less important explains why Stormpulse.com has a higher PageRank than wunderground.com, even though we only have about 35,000 inbound links whereas wunderground has over 12 million.

halo · on April 9, 2009

Since this is all a black art and guesswork at best and pseudo-science at worst...

The most obvious and simple method is to get an average PageRank of all pages and if it's higher than average use that figure to bias the results as 'domain authority'.

I think there is some sort of bias towards newness, so more recent links are worth more, and newer sites are biased to have a higher initial PageRank.

noelchurchill · on April 9, 2009

I was curious about the "domain authority" point as well. He linked to another blog post at the bottom of the article that talks about that: http://www.seomoz.org/blog/my-personal-opinion-90-of-the-ran...

barredo · on April 10, 2009

Historical domain inbound links, rate of appearance of the new inbound links, and authority of the domain and documents where they come from