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.
Comparing Domain Authority Scores
-
Since your scale (like PageRank) is a logarithmic scale, it makes it hard to judge the distance between 2 scores. Can you give me a rule of thumb. For PageRank, each jump is an exponential jump - so that a PR6 is perhaps 10 times stronger than a PR5.
What is the log base that SEOMoz uses. Should I assume that a 60 is 10 times stronger than a 50?
This is important when it comes to measuring progress because growth is going to get more difficult as you move up the scale and I need to communicate the distance between our current Authority score and our goal.
Thank You!
-
Talked to Dr. Matt, and he said that, if you just want an estimate, take the log (base 10). You'll get a value from zero to two that will be roughly linear, and then you can scale it up to whatever range you need.
-
Hi Peter,
I have a follow up question to your reply; I want to try and use DA together with other linear metrics to create my own value that I can use for different purposes.
Considering your answer above it seems to me, and I have very little mathematical knowledge, that there is no exact log base I can use to get an "exact" representation of what a DA value is trying to express. Does that seem like a correct understanding?
Then, from a practical point of view, how would you recommend I convert DA values to a linear scale? Close enough is good enough i guess.
Thanks //David
-
I'm afraid the answer is "it's complicated" - here's the longer version, from Dr. Matt Peters, our head of Data Science:
"PA and DA are the output from a machine learning model that we then rescale to values between 1-100. The raw output from the model is dimensionless and doesn't have any interesting meaning. The rescaling is linear, but the inputs to the model are rescaled logarithmically before being used in the model. We use the natural log (base e) but the base is pretty arbitrary since one can transform from one base to another by changing coefficients, and the coefficients themselves are set in a regression. The key point is that since the inputs have a log applied to them it is much harder to increase DA from say 70 to 80 then it is from 30 to 40."
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
-
Unsolved How to Reduce the spam score of the website?
My website is https://usapickleballrules.org it is a informational website and Moz shows a spam score of 8,may i know why my site spam score is high and how can i reduce it,after all it is a dubai store portal.
Moz Pro | | rameezmirza2 -
Solved How to reduce the spam score for my domain?
My domain longfeifei.com is for a regular company website and someone sent a lot of external links on different low-quality websites on the internet. Now the score is very high about 75%. If I disavow the unusual links from google search console. Is it possible to reduce the spam score? Is MOZ associated with GOOGLE Data? Thanks,
Moz Pro | | niaokun6838072 -
Comparing New vs. Old Keyword Difficulty Scores
We've had a few questions regarding the new Keyword Difficulty score used in Keyword Explorer, and how it compares to the old score in our stand-alone Keyword Difficulty tool. Specifically, people want to know why some scores are much lower using the new tool. There a general discussion of the math behind the tool in this post: Keyword Research in 2016: Going Beyond Guesswork One of the problems we had with the original Keyword Difficulty score is that, because it's based on our Page Authority (PA) score and PA tends toward the middle of the 0-100 range, Difficulty got a bit bunched up. A Difficulty score in the low-to-mid 20s (via the old tool) is actually very low. So, we set out to re-scale the new tool to broaden that score and use more of the 0-100 range. We hoped this would allow more granularity and better comparisons. While the logic is sound, we're concerned that we may have been too aggressive in this re-scaling, given recent feedback. So, we're going to be analyzing a large set of keywords (anonymously, of course) that people have run through the tool to see if too many Difficulty scores seem too low. If they do, we'll make some adjustments to the math. In the meantime, please be aware that low scores may appear lower in the new tool and very high scores may appear higher. We wanted to address some of the limitations in V1 and feedback over the years, and so the old and new scores really can't be compared directly in a meaningful way. We're sorry for any confusion that has caused, and we will re-evaluate if necessary.
Moz Pro | | Dr-Pete3 -
Is there a way to get the domain authority of a subdomain?
For example, www.storage-mart.com and us.storage-mart.com both show the same DA in OSE. I believe it's the DA of the root domain. How can I compare the DA of the 'www' and 'us' subdomains?
Moz Pro | | Whitespark0 -
Domain.com and domain.com/index.html duplicate content in reports even with rewrite on
I have a site that was recently hit by the Google penguin update and dropped a page back. When running the site through seomoz tools, I keep getting duplicate content in the reports for domain.com and domain.com/index.html, even though I have a 301 rewrite condition. When I test the site, domain.com/index.html redirects to domain.com for all directories and root. I don't understand how my index page can still get flagged as duplicate content. I also have a redirect from domain.com to www.domain.com. Is there anything else I need to do or add to my htaccess file? Appreciate any clarification on this.
Moz Pro | | anthonytjm0 -
Why are my sub-domains ranking higher than my Root Domains?
I have just noticed that my sub-domains are ranking higher in Mozrank and Moztrust than the root domain - that seems nuts. Am I doing something wrong?
Moz Pro | | simonberenyi0 -
Why do some sites have a higher Page Authority than Domain Authority in OSE??
Hi, I have noticed when using OSE and enter a domain you very often see a higher Page Authority than Domain Authority. If someone could explain why this would happen then I would be very grateful - its my current understanding that page authority would ALWAYS be LESS THAN Domain Authority but that is not always the case (I have seen cases where PA is more than 10 higher then DA) Here's an example where PA > DA http://www.opensiteexplorer.org/links.html?site=www.primelocation.com Thanks
Moz Pro | | James770