26 August 2017
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This article would highlight the purpose and guidelines into using Domain Authority, Page Authority and othe linking root domains such as Spam Score.

Page Authority (PA)

PA is the accumulation of all the metrics from the link index that are implemented on a certain model with training data being added to it. The training data would mean Google search results and the PA is used as the indicator of the success of a page on Google search results. But, the point to be noted here is that PA is being treated as only link data without any on-page data, content data, engagement data, and other outlines.

Everything that is visible from the link profile and domain base is known which is then inputted into the training data. There is a machine learning model that uses the Google search results and constructs the ideal model from it. The model dumps all the unnecessary data and only adds the useful ones such as vectors.

On the basis of the links on hands, this is the best predictive score that could be fetched. PA is the most appropriate for a variety of things and it would provide the best web page ranking disregard of all the non-link factors.

Domain Authority (DA)

DA can only be pointed towards once the PA model and its strategy is developed because it is the root domain level version of the PA model. The bad part about DA is that it only supports root domains with no room for sub-domains which means that it does not provide the user with the edge. The good part is that it will give the best prediction about the ranking position of a domain’s page on Google. It eliminates the page level information without effecting the operations at the domain level. This is a very fruitful aspect of it.

Linking Root Domain

The linking root domains is the easiest of the lot. It is the accumulation of the specific root domains with one link in it that points towards one webpage. For example, there is a URL X that has 410 linking root domains. This means that there are 410 domains with at least one link that point towards URL X.

Whether the links are followed or not followed is something dependent on the specifications. If it is not specified then it is a combination of the two. Therefore, it shall be checked again so that a non-following link does not creep into a linking root domain. The small question mark icon on the side of any given metric such as Majestic or Moz, would inform the user of the links that are included and the ones that are not.

Due to a number of reasons, DA should not be made the focal one for people that keep tracks of monthly link building performances. Moz’s index is the only index from all other well-known toolsets for link data that calculates DA or machine learning model, once each month. Hence, making it very difficult for people that want to make a report on DA from the last update of last link index. There is a new index that will be launched in a few months. It would replace the current Mozscape and would help in calculating DA and PA far more rapidly than its doing now.

Till the Mozscape is launched, following recommendation are being made:


  1. The number of linking root domains and the way it has grown over years.
  2. The organic ranking for the targeted keywords of a webpage. Even though this is not a proper and accurate link metric but it can help gauge the performance of the links that have been impacted. If the webpage is being checked for monthly performance and if during any months, if there have been 20 to 30 successful days then Google would be able to recognize it. This would be a great alternative for knowing the way link building has helped the search results.
  3. The third is the systematic distribution of DA. Even though DA is not the number choice but it can be an integral part of a link building performance report. The high number of DA links that one is receiving can be beneficial. It is a perfect sorting mechanism that would point towards more authoritative websites.
  4. If a considerable amount of link building is being done then Spam Score can be very useful. The reason is that the DA does not punish or decrease the score for a high Spam Score. But, Spam Score will tell the users that even though a website is good on the outside with a reasonable number of DA and reliable links but has a spam nature to it. For example, a website that has a DA score of 60 and the Spam Score of 7 or 8, that is slightly concerning. But, if the score rises to 9 to 11 then it could become more damaging.

Second question:

There is another question that a lot of people ask and that when they and their competitors have certain links, then they want to know which ones are providing the most value to them? In such a scenario where the link is pointing towards them, the best one would be:

The link that is diverting traffic towards the website is definitely the best one that is also providing the most value. It would also be evident in the search engine results. This is known as real traffic.

  • PA
  • DA


  1. The number of links to a page or a domain.
  2. A link that provides a rise in the ranking is also an amazing and valuable link. For example, if the website is being ranked fourth in the list and only one single link is changed. If nothing else is changed apart from that one link and the rankings go up then it means that it was a valuable link.
  3. The Spam Score is another good indicator because if the link is increasing the Spam Score then it would be blacklisted in the mind and vice versa.

If SEO marketers are having a dilemma over which links to pursue and which to leave among the list that they have in their mind then one should resort to the following:

  1. DA is one of the best metrics because it is a good predictor of the domain’s pages’ performance on Google.
  2. Linking root domains is another powerful one because it has some similarity to DA and rankings.
  3. Spam Score, for the reasons mentioned above.
  4. SimilarWeb’s is a really good one because it has the best traffic prediction system.
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