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.
-
Hi, any update on this thread? I'm facing the same dilemma currently. I need to know exactly how much more powerful a DA of 50 is vs. 30, for example. If there's any way to access the most top-level estimation of the logarithmic scale, it would be greatly appreciated.
-
I received a response in the developers forum which basically said the input data is scaled logarithmically rather than the output being linear which is then scaled logarithmically.
This means it's impossible to answer the question.
However I have asked (and repeated the question here for the sake of anyonewho's interested)...
What is the distribution of DA values across all values? It would be nice to know that "the median DA across all sites in our database is x." That would at least put the numbers in some perspective - and it's perspective I'm trying to get.
Can you also confirm if the "keyword difficulty" is also calculated with logarithmic inputs? And what's the median keyword difficulty?
-
Unfortunately, I'm not sure it's as simple as an equation - we use a machine-learning algorithm and I think the result just happens to be logarithmic. I know who knows the answer, though, so let me ask and see if it's something we're able to discuss.
-
I understand Adam. As I shared, I am not sure SEOmoz is willing to publicly disclose details of it's algorithm. The best chance to find out more is likely to follow Megan's advice and open a discussion in the developer forum.
-
No, I'm not seeking something deeper at all.
I don't care how they work out DA / PA.
The result is between 0 and 100, but they say it's logarithmic.
So is it log(x), or log(x+3), or log2(x)... ? ?
-
I expect you will receive a response from the Moz team by Monday on your other open Q&A / ticket. The person who answers that question may be able to answer this one, or pass your inquiry along to someone who does.
I believe reverse-engineering the PA / DA is pretty straight forward. To the best of my knowledge, the following is true regarding the calculation:
-
It is 100% based solely on link data
-
OSE is the single data source for the calculation
-
there are only a few factors: the PA/DA of any linking pages/sites, the number of links on the page providing the link, the number of links being received by the page/site.
-
typical factors known to be used in PR such as relevancy, link location, etc. are not factors in PA/DA
-
spam factors are not considered in PA/DA
To the best of my knowledge the above is correct. Only a SEOmoz employee could possibly confirm and I am unsure on their NDA requirements. I would expect their formula is proprietary.
With the above understood, a DA of 30 represents the number and quality of links received for the website. The same applies to PA.
A site with DA of 29: http://www.cheshirecatnarrowboats.co.uk/
A page with PA of 31 http://www.shmoop.com/alice-in-wonderland-looking-glass/cheshire-cat.html
I recognize you are likely aware of the above information and seeking something deeper. I am sharing this information in case it is helpful.
-
-
I absolutely agree to re-invent the wheel is inefficient when people like SEOmoz have thousands of man-hours in developing great metrics... but I use the SEOmoz metrics along side other metrics for a few reasons:
-
To confirm the validity of metrics between providers and my own research
-
To customise the kinds of reports I give clients. For example, sometimes a link profile report is more relevant for a customer than a domain authority report. Sometimes both are relevant, etc.
It just sucks when you have to put caveats on data such as saying that the SEOmoz authority metric is logarithmic but to an unknown logarithmic curve.
I think SEOmoz should publish the logarithmic calculation. I'm not asking for their intellectual property on how they calculate authority or keyword difficulty, etc... I just want to know the logarithmic calculation. Otherwise I'm left asking, "what does 30 actually mean?" In addition, is the keyword difficulty logarithmic? SEOmoz doesn't say.
Adam
-
-
I can't say exactly what formula is used for PA/DA, but it is designed to emulate PR. Either way, as long as you include PR you already have a logarithmic metric.
Whatever system you use will be challenging. Why?
-
Google includes 200+ metrics to determine search result positioning
-
Google adjusts search results based on numerous personal factors including location, browsing history, etc
-
It is pretty safe to say Google's algorithm includes metrics which are linear, exponential and logarithmic
With dozens of various tools on the market designed to analyze keywords, why not chose to utilize an existing tool which is professionally developed and maintained for this purpose?
-
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
-
Domain Authority Dropped from 13 to 1
Hi there, I know Domain Authority is not a KPI, it's a relative metric but we saw a huge dropped down in our domain authority this week and I got worried. I am trying to understand why this happened? Any idea? Our website link is here https://www.wealthmanagementcanada.com Is it something related to Moz update or with our website? Regards,
Moz Pro | | ahmetkul
Ahmet0 -
Big drop in Domain Authority on 17 Nov 2015
Hello, My domain authority dropped on 17 Nov 2015 Domain name is: http://www.proprofs.com/ drop from 74 to 68 Also on another domain : http://www.marriage.com/. Drop from 38 to 34. Very much surprised by this big drop? Would appreciate everyone's feedback? Thanks
Moz Pro | | SameerBhatia0 -
'Duplicate Page Content' for dissimilar pages
I'm using Moz's Crawl Diagnostics to try and clean up some SEO priorities for our website (http://www.craftcompany.co.uk) HOWEVER, virtually all of the pages that are being categorised as duplicate content are not the same, or indeed similar. For instance, these three pages have been deemed duplicated pages; http://www.craftcompany.co.uk/pme-rose-leaf-veined-plunger.html http://www.craftcompany.co.uk/double-faced-satin-ribbon-black-25mm-wide.html http://www.craftcompany.co.uk/double-faced-satin-maroon-10mm-wide-25mt.html Can anyone give me an insight into why this is? Many Thanks! http://www.craftcompany.co.uk/
Moz Pro | | The_Craft_Company0 -
How to remove 404 pages wordpress
I used the crawl tool and it return a 404 error for several pages that I no longer have published in Wordpress. They must still be on the server somewhere? Do you know how to remove them? I think they are not a file on the server like an html file since Wordpress uses databases? I figure that getting rid of the 404 errors will improve SEO is this correct? Thanks, David
Moz Pro | | DJDavid0 -
On Page URL's not updating?
I recently moved my site to Shopify which completely changed the URL structure. I went to my old pages and created permanent 301 redirects to my new pages on shopify. For some reason, the On Page reports are not picking up on one of the new pages. This is effecting my grading. Just wondering why this is happening & whether this may be an indication of a larger problem? Any help would be greatly appreciated! Thanks!
Moz Pro | | PedroAndJobu0 -
Massive Rank Changes in Bing/Yahoo Only - What's up w/ Rank Tracker?
I'll be honest, it's pretty shameful how little attention I give Bing and Yahoo. But something recently caught my eye - I have a client who according to rank tracker is all over the place in yahoo/bing...up 20 positions for some kw's, down 12 for others...meanwhile Google's holding steady, and Google data seems mostly accurate - with one exception of showing 46th position for an exact match branded search that they're #1 for. I know Rank Tracker has been going through some fine tuning, right? I don't manually check Yahoo/Bing - I can't imagine those #'s are accurate though. Am I right to assume it's incorrect data? Just curious, any insight would be much appreciated. Thanks
Moz Pro | | SVmedia0 -
Page Penalization
Hiya, Looking for some advice, i have a page which the on page optimization tool shows as an A grade and Google has indexed it. I have checked vie site: however is not being found in search results even for an exact match on the page title which is very specific. I believe the page may be being penlized for over optimisation? any advice would be great! URL is www.tots-away.com/child-friendly-holidays-spain/
Moz Pro | | iprosoftware0 -
Why There is no Page Authority in none of my websites?
I just saw, SEOMoz updated their Page Authority, Mozrank and Domain Authority. However in most of my websites, the Page Authority got reset. Am I doing something wrong?
Moz Pro | | GroupM0