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Ryan Jones
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Lots of talk about Google "domain authority" lately. Gary mentioned that DA isn't a factor - and I tend to think the same thing. For starters, DA as we know it is something that Moz invented. Google doesn't use moz metrics (or twitter or facebook but that's another story.)

when it comes to ranking though, Google doesn't look explicitly at the authority of your domain when determining to rank a page.

They use Pagerank, and what we consider domain authority is inherently built into the pagerank formula. No, not tool bar pagerank that we used to see as a score from 0-10 that hasn't been updated in years and is dead. Actual pagerank, calculated and used in the algorithm. The core of the search algorithm still.

See, pagerank of a page is basically the sum of the pagerank of all the pages linking to it, divided by the number of links on that page. Plus a dampening factor to make it such that the PR of every page on the web adds up to 1. It's really neat math.

Anyway... Since you can assume most pages are linked to from many other pages on the same domain (your main nav, your footer, your sitemap, etc), they inherit the pagerank of that domain. So you don't need to calculate domain authority separately, it's built into the pagerank formula.

having a "domain authority" score would only add noise to the algorithm. You can test this yourself. Take a very high "authority" domain and create a page on it. Now don't link to that page at all. Guess what, you won't rank very well. 

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