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
-
I bought a 5 year old domain and has a spam score of 23%.....
A few months ago i bought a 5 year old domain and when i went to check in Moz pro the spam score, it shows its at 23%. DA is 1 everything else is 0. The spam score shows 23% but there are no links at all for this website (see image) https://imgur.com/a/3lHjLEh I don't understand, there are no links at all going to this website. I checked google search console, analytics and tried looking for any links linking to this domain and there is none. Even Moz isn't showing any links in the picture i provided above. Is this a glitch? Can i reset my spam score on this domain? Does that mean i wasted my money on this domain and now i can't rank with it? Is there something im missing here. I also checked is there are any warnings or manual actions and it clearly says "No issues detected". A few months earlier i bought a brand new domain very close to the 5 year old domain (new domain has a z instead of an s) and the spam score on that is 0 and DA is 1. Given that the 5 year old domain has a 23% spam score, does that mean i should use the other new domain instead and redirect the 5 year old domain to the new website?
Moz Pro | | Nor1230 -
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 / Page Authority - logarithmic
SEOmoz says their Domain / Page Authority is logarithmic, meaning that lower rankings are easier to get, higher rankings harder to get. Makes sense. But does anyone know what logarithmic equation they use? I'm using the domain and page authority as one metric in amongst other metrics in my keyword analysis. I can't have some metrics linear, others exponential and the SEOmoz one logarithmic.
Moz Pro | | eatyourveggies0 -
Keyword Difficulty Score Not Available
What exactly does this mean? That the service is down? Or the score will never be available? It seems like I get that and then the tool gets stuck and I get no other data.
Moz Pro | | endlessrange0 -
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 -
Spam Directories creating misleading Authority ratings
How does the website www.starsdirectory.com.ar get a Domain Authority of 54 and a Page Authority of 61 when Google quite correctly gives it a PR 0? It is clearly a spam directory, which Google has recognised. It is very misleading using OSE or Campaign Management when sites such as these (and there are hundreds more we have found) are skewing the results of competitiors through the use of spam links. Is there no way that SEOMoz tools can identify such spam sites when they create their ratings?
Moz Pro | | paulsmithlondon0