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?
-
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
-
Moz Domain Authority 27
Hi there, I have been reading up about Domain Authority being important to rank though I have a question about it. When trying a few google searches and using a tool to see the Moz Domain Authority i notice the following. I won't mention sites or keywords, happy to send them via private message if required. A site ranks 1st position for most keywords including the main keyword that related to their industry, a highly competitive keyword. Their Moz Domain Authority 27, Est. Visits: 265,000, Pinterest shares 72, Facebook shares 191 and unique domains that point to it are 55. Yet when I look at another site, optimising for the same keyword, Moz Domain Authority 50, Est. Visits: 60,000, Pinterest shares 35000, Facebook shares 20000 and unique domains that point to it are 521. I would have thought that the second site ranks 1st for the keyword and the first one mentioned which is in 1st position I would have expected to be on page two or three. as I scroll down the first page for the term, all sites except for one have higher DA, visits, shares and so on. If a high PA is required can someone help me to understand the above example? Whn a low PA site ranks much better for a primary keyword than all other sites that have a higher PA than it?
Moz Pro | | IvanaDaulay1 -
A 301 redirect to a page with a rel canonical to a page with a 301 question...
MOZ registers thousands of DC and Duplicate titles on a Drupal site which has a little strange setup. Example: www.1234.com/en-us 301 redirects to www.realsite.com/en-us which has a rel canonical to www.1234.com which 301 redirects to www.realsite.com. If you're still with me I thank you.
Moz Pro | | Crunchii
My question is since MOZ registers errors, if indeed the rel canonical isn't recognized due to a 301 redirect?0 -
Page Authority Bulk Check?
Hi all, Was wondering if maybe using the SEOmoz API there was a way to check in excel the page authority of 500 URLs or more? Or is there a different way to do this? Thanks, Carlos
Moz Pro | | Carlos-R0 -
"Issue: Duplicate Page Content " in Crawl Diagnostics - but sample pages are not related to page indicated with duplicate content
In the crawl diagnostics for my campaign, the duplicate content warnings have been increasing, but when I look at the sample pages that SEOMoz says have duplicate content, they are completely different pages from the page identified. They have different Titles, Meta Descriptions and HTML content and often are different types of pages, i.e. product page appearing as having duplicate content vs. a category page. Anyone know what could be causing this?
Moz Pro | | EBCeller0 -
Issue: Duplicate Page Content
For pro members: Is there a way to see exactly what "it" is that is duplicate? Also, what % of duplicate content is required to be labeled as dupped. Much thanks, Chenzo
Moz Pro | | Chenzo0 -
Too Many On-Page Links
The SeoMoz site crawler says all my pages have too many links. I am using Dreamweaver with a horizontal Spry drop-down menu bar. My site has several hundred pages and about 100 of them show up in this Spry menu bar. I believe that this would be considered a false positive for too many links - am I right? Or is Google seeing this also as too many links per page? I am trying to get my Google rankings back after being hurt badly by the Penguin. I am using php but don't see another way to do the site links without going to a CMS type site. Thanks for any help you can give.
Moz Pro | | johnsearles0 -
New site on page check
hello wonderful Mozzers, I am building a new site and was wondering if any of you knew any latest " thorough" ON Page Check Lists? I want to make sure I build the site right, and do every bit of on page and new site seo right. I have access to the SEOMOZ guides as well. Have a fab day guys, Best, Vijay
Moz Pro | | vijayvasu0 -
Where can I find a list of all Page Authority Metrics?
Where can I find a list of all Page Authority Metrics? I'm looking for an exhaustive list of all link metrics that calculate Page Authority? Thanks
Moz Pro | | poolguy0