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
-
High Page Authority / Low Domain Authority
I have been building links to the home page of my web site. At this point, the site has a DA of 22 and the home page has a PA of 35. I am a bit puzzled as to how the PA can be so much higher than DA. I suppose it might have something to do with the fact that most of the inbound links are going to the home page. Are there any other factors that might be contributing to this situation? Does it point to a weakness in our backlink profile?
Moz Pro | | NathanSchlink1230 -
Domain name migration
I have purchased a new domain name (b), shorter and more cool than the one I'm actually using (a). Also I'm planning to use wordpress on (b), since my actual site was build entirely on html. So lets say making a migration so slowly. In the meantime I finish (b), I would like to include the name on my cards, and other promos, as well as actualize the new name in all my social profiles. I thinked on doing a 302 on (b) pointing to (a), till the day it will be finished. That day I'll do the opposite, so pointing (a), this time with a 301, to (b). Is this the best way of doing it, in terms os SEO? Thanks
Moz Pro | | antoniomitalia0 -
Search Volume in Keyword Rankings Page
Is there a way to show search volumes for keywords in the Keyword Rankings tab page? A lot of times keywords we are ranking for are added to our campaign, and it would be very useful to see the search volumes within that grid. That way we could sort by the search volume and determine which keywords are worth targeting and optimizing for. I've had this ability with other software in the past and would be a great option for either Moz Pro version or the new Beta that is coming out. Which I'm still waiting for my invite BTW:)
Moz Pro | | agencypromogroup0 -
How to download domain authority of bulk links using paid seomoz tool?
i would like to download domain authority of 50 domains at once. Is it possible with seomoz tool? If yes, can some one tell me how to do that?
Moz Pro | | Sasank0 -
Missing Page Titles On The Comptetive Link Comparison Page
Hello, When I do a Link Analysis using the SEOmoz tools I have noticed that most of the pages listed on the Top Pages tab show [No Data] for page title. Any idea why that could be? The page source of those pages have one and only one <title>tag.</p> <p>Thanks!</p></title>
Moz Pro | | andersvin0 -
"Too many on-page links" warning on all of my Wordpress pages
Hey guys, I've got like 120 "Too many on-page links" warnings in my crawl diagnostics section. They're all the pages of my WordPress blog. Is this an acceptable and expected warning for Wordpress or does something need to be better optimized? Thanks.
Moz Pro | | SheffieldMarketing0 -
How to check Page Authority in bulk?
Hey guys, I'm on the free trial for SEOmoz PRO and I'm in love. One question, though. I've been looking all over the internet for a way to check Page Authority in bulk. Is there a way to do this? Would I need the SEOmoz API? And what is the charge? All I really need is a way to check Page Authority in bulk--no extra bells and whistles. Thanks, Brandon
Moz Pro | | thegreatpursuit0 -
On Page Report Card... with or w/o local modifiers?
Hey all! So I am curious how you recommend using the "on page report card" (which is really helpful) along with the concept of local modifiers. IE, here is a term I am going after: business forums but really I care about a specific location: business forums | Greensboro NC So the word I hear is typically to do your keyword research & page optimization FOR the primary term, but then tack on your local modifiers after. So which do you run reports on? Probably both is the best answer, eh? Obviously my local sites won't have a shot at ranking nationally/internationally for such a broad term as "business forums", especially with some monster sites out there with some serious clout. This is more of a best practices question. Thanks dudes.
Moz Pro | | nsmcseo20