Moz Q&A is closed.
After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
How much domain authority is passed on through a link from a page with low authority?
-
Hello,
Let's say that there is a link to site A from site B. The domain authority of site B is 85, but the link is on a page that has a page authority of only 1. Does much authority get passed along from site B to site A? (Let's assume site A has a domain authority of 35, if that's relevant.)
Thank you!
-
Thanks, Federico.
-
Thank you, Keri!
-
Thank you very much, Dr. Meyers! This was extremely helpful.
-
Unfortunately, Dr. Matt's out of town, so this answer won't be as thorough as I'd like, but the gist of it is that we factor in both DA and PA to some degree. If a site has very high DA but a very low PA (as in your example), we're going to bias somewhat toward the DA, as we believe Google sometimes does (a virtually unknown page on Wikipedia can rank very well, for example). Likewise, a high-PA page on a site with low DA may pass more through the PA, because (hopefully) that page has some legitimate authority.
It's a bit more complex, because DA and PA are related as well, so they do influence each other to some degree. On larger sites, the influence of any single page's PA is small, but the influence can be more obvious on smaller sites.
Putting aside our math, I think a link from a low-authority page on a high-authority site can be worthwhile. Look at directories, like DMOZ. I think it's important to make sure the low-PA page is indexed (some DMOZ pages aren't, because they're buried so deeply in the link structure), and I wouldn't get hung up on a link from a high-DA site. It's ultimately just one link. I wouldn't dismiss it as useless either, though. There's some amount of site/page balance in the mix and Google doesn't rely on only one type of authority.
-
I'm checking with Dr. Matt Peters, head of our Data Science team. It's less about secrecy and more that DA/PA are based on machine learning and have gotten a bit complex. Still, I suspect we can give you a general sense of how DA/PA pass through links. Posting this because I suspect an answer may take a day or two.
-
Well, it is a bit late for regular office hours for most Moz staff, so you may not hear an answer until tomorrow. The answer may also include "remember, what the search engines think is what matters", but you should get an answer with at least some information in the next couple of days.
-
and I am sure Moz will not answer this at all!
-
It is, but no one outside Moz can answer that, there are several metrics that affect authority passing, and I guess that most of those metrics and algos are property of Moz and most likely secret to prevent abuse.
Got a burning SEO question?
Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.
Browse Questions
Explore more categories
-
Moz Tools
Chat with the community about the Moz tools.
-
SEO Tactics
Discuss the SEO process with fellow marketers
-
Community
Discuss industry events, jobs, and news!
-
Digital Marketing
Chat about tactics outside of SEO
-
Research & Trends
Dive into research and trends in the search industry.
-
Support
Connect on product support and feature requests.
Related Questions
-
Can I use a 301 redirect to pass 'back link' juice to a different domain?
Hi, I have a backlink from a high DA/PA Government Website pointing to www.domainA.com which I own and can setup 301 redirects on if necessary. However my www.domainA.com is not used and has no active website (but has hosting available which can 301 redirect). www.domainA.com is also contextually irrelevant to the backlink. I want the Government Website link to go to www.domainB.com - which is both the relevant site and which also should be benefiting from from the seo juice from the backlink. So far I have had no luck to get the Government Website's administrators to change the URL on the link to point to www.domainB.com. Q1: If i use a 301 redirect on www.domainA.com to redirect to www.domainB.com will most of the backlink's SEO juice still be passed on to www.domainB.com? Q2: If the answer to the above is yes - would there be benefit to taking this a step further and redirect www.domainA.com to a deeper directory on www.domianB.com which is even more relevant?
Technical SEO | | DGAU
ie. redirect www.domainA.com to www.domainB.com/categoryB - passing the link juice deeper.0 -
Old domain to new domain
Hi, A website on server A is no longer required. The owner has redirected some URLS of this website (via plugin) to his new website on server B -but not all URLS. So when I use COMMAND site:website A , I see a mixture of redirected URLS and not redirected URLS.Therefore two websites are still being indexed in some form and causing duplication. However, weirdly when I crawl with Screaming Frog I only see one URL which is 301 redirected to the new website. I would have thought I'd see lots of URLs which hadn't been redirected. How come it is different to using the site:command? Anyway, how do I move to the new website completely without the old one being indexed anymore. I thought I knew this but have read so many blogs I've confused myself! Should I: Redirect all URLS via the HTACESS file on old website on server A? There are lots of pages indexed so a lot of URLs. What if I miss some? or Point the old domain via DNS to server B and do the redirects in website B HTaccess file? This seems more sensible but does this method still retain the website rankings? Thanks for any help
Technical SEO | | AL123al0 -
Footer Links with same anchor text on all pages
We have different websites targeted at the different services our company provides. (e.g. For our document storage services, we have www.ukdocumentstorage.com. For document management, we have www.document-management-solutions.co.uk). If we take the storage site for example, every single page has a link in the footer to our document management site, with the anchor text 'Cleardata Document Management' SEOMoz is telling me that these are seen as external links (as they are on a different URL's), and I'm just clarifying that would this be a major possible factor in the website not ranking highly? How should I rectify this issue?
Technical SEO | | janc0 -
Transfer a Main Domain to a Sub-Domain
My IT department tells me they want to transfer my main site domain, which has been in existence since 1999 as an e-commerce site (maindomain.com) to a sub-domain (www2.maindomain.com) or a completely new domain (newdomain.net). This is because we are launching a new website and B2C e-commerce engine, but we still have to maintain the legacy B2B e-commerce engine which contains hard-coded URLs, and both systems can't use the same domain. I've been researching the issue across SEOmoz, but I haven't come across this exact type of scenario (mostly I've seen a sub-domain to new domain). I see major problems with their proposal, including negative SEO impact, loss of domain authority/ranking and issues with branding. Does anyone know the exact type of impact I can expect to see in this scenario and specific steps I should go about to minimize the impact? Btw, I will be using Danny Dover's guide on properly moving domains where appropriate. Thanks!
Technical SEO | | AscendLearning0 -
404 error - but I can't find any broken links on the referrer pages
Hi, My crawl has diagnosed a client's site with eight 404 errors. In my CSV download of the crawl, I have checked the source code of the 'referrer' pages, but can't find where the link to the 404 error page is. Could there be another reason for getting 404 errors? Thanks for your help. Katharine.
Technical SEO | | PooleyK0 -
Determining When to Break a Page Into Multiple Pages?
Suppose you have a page on your site that is a couple thousand words long. How would you determine when to split the page into two and are there any SEO advantages to doing this like being more focused on a specific topic. I noticed the Beginner's Guide to SEO is split into several pages, although it would concentrate the link juice if it was all on one page. Suppose you have a lot of comments. Is it better to move comments to a second page at a certain point? Sometimes the comments are not super focused on the topic of the page compared to the main text.
Technical SEO | | ProjectLabs1 -
How to remove the 4XX Client error,Too many links in a single page Warning and Cannonical Notices.
Firstly,I am getting around 12 Errors in the category 4xx Client error. The description says that this is either bad or a broken link.How can I repair this ? Secondly, I am getting lots of warnings related to too many page links of a single page.I want to know how to tackle this ? Finally, I don't understand the basics of Cannonical notices.I have around 12 notices of this kind which I want to remove too. Please help me out in this regard. Thank you beforehand. Amit Ganguly http://aamthoughts.blogspot.com - Sustainable Sphere
Technical SEO | | amit.ganguly0 -
Does Google pass link juice a page receives if the URL parameter specifies content and has the Crawl setting in Webmaster Tools set to NO?
The page in question receives a lot of quality traffic but is only relevant to a small percent of my users. I want to keep the link juice received from this page but I do not want it to appear in the SERPs.
Technical SEO | | surveygizmo0