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 -
Does a no-indexed parent page impact its child pages?
If I have a page* in WordPress that is set as private and is no-indexed with Yoast, will that negatively affect the visibility of other pages that are set as children of that first page? *The context is that I want to organize some of the pages on a business's WordPress site into silos/directories. For example, if the business was a home remodeling company, it'd be convenient to keep all the pages about bathrooms, kitchens, additions, basements, etc. bundled together under a "services" parent page (/services/kitchens/, /services/bathrooms/, etc.). The thing is that the child pages will all be directly accessible from the menus, so there doesn't need to be anything on the parent /services/ page itself. Another such parent page/directory/category might be used to keep different photo gallery pages together (/galleries/kitchen-photos/, /galleries/bathroom-photos/, etc.). So again, would it be safe for pages like /services/kitchens/ and /galleries/addition-photos/ if the /services/ and /galleries/ pages (but not /galleries/* or anything like that) are no-indexed? Thanks!
Technical SEO | | BrianAlpert781 -
Why are these internal pages not showing any internal links?
If you look at Author profile pages like this one, http://experts.allbusiness.com/author/denise-oberry (THE top contributor on the site with over 82 posts under her belt), or any Author profile page, they show zero internal links or Page Authority. The same goes for most posts for each author on the site. Author pages should show internal links from every post the author has on the site. And specific posts should also have internal links from categories, etc. Yet they show zero. The only posts that show internal links and PA are ones that were either syndicated to the root domain's homepage, or syndicated to Fox Small Business. ZERO internal links. Does anyone know why this is? The root domain does not act this way with Author pages and posts. And I see nothing blocking links or indexing via the robots.txt file or page level nofollow tags. A real head scratcher for this SEO nerd, that I'm sure someone here will have a really simple answer to.
Technical SEO | | MiguelSalcido0 -
Ok to internally link to pages with NOINDEX?
I manage a directory site with hundreds of thousands of indexed pages. I want to remove a significant number of these pages from the index using NOINDEX and have 2 questions about this: 1. Is NOINDEX the most effective way to remove large numbers of pages from Google's index? 2. The IA of our site means that we will have thousands of internal links pointing to these noindexed pages if we make this change. Is it a problem to link to pages with a noindex directive on them? Thanks in advance for all responses.
Technical SEO | | OMGPyrmont0 -
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 -
Splitting Page Authority with two URLs for the same page.
Hello guys, My website is currently holding two different URLs for the same page and I am under the impression such set up is dividing my Page Authority and Link Juice. We currently have the following page with both URLs below: www.wbresearch.com/soldiertechnologyusa/home.aspx
Technical SEO | | JoaoPdaCosta-WBR
www.wbresearch.com/soldiertechnologyusa/ Analysing the page authority and backlinks I identified that we are splitting the amount of backlinks (links from sites, social media and therefore authority). "/home.aspx"
PA: 67
Linking Root Domains: 52
Total Links: 272 "/"
PA: 64
Linking Root Domains: 29
Total Links: 128 I am under the impression that if the URLs were the same we would maximise our backlinks and therefore page authority. My Question: How can I fix this? Should I have a 301 redirect from the page "/" to the "/home.aspx" therefore passing the authority and link juice of “/” directly to “/homes.aspx”? Trying to gather thoughts and ideas on this, suggestions are much appreciated? Thanks!0 -
How to increase your Domain Authority
Hi Guys, Can someone please provide some pointers on how to best increase your Domain Authority?? Thanks Gareth
Technical SEO | | GAZ090 -
How much authority does a 301 pass to a different domain?
Hi, A client of mine is selling his business to a brand new company. The brand new company will be using a brand new domain (no way to avoid that unfortunately) and the current domain (which has tons of authority, links, shares, tweets, etc.) will not be used. Added to that, the new company will be taking over all the current content with just a few minor changes. (I know, I wish we could use the old domain but we can't.) Obviously, I am redirecting all pages on the current domain to the new domain via 301 redirects on a page by page basis. So, current.com/product-page-x.html redirects to new.com/product-page-x.html. My client and the new company both are asking me how much link juice (and other factors) are passed along to the new domain from the old domain. All I can find is "not the full value" or variants thereof.My experience with 301 redirects in the past has been within a single domain and I've seen some of those pages have decent authority and decent rankings as a result of the 301 (no other optimization work was done or links were added). Are there any studies out there that I'm missing that show how much authority/juice gets passed and/or lost via a 301 redirect? Anybody with a similar issue see any trends in page/domain authority and/or rankings? Thanks for any insights and opinions you have.
Technical SEO | | Matthew_Edgar0