The domain name authority of a web site describes its relative relevance to a specific topic area or industry.
This relative relevance has a profound effect on the ranking of a site by major search engines, attempting to measure domain authority via complex and ever changing algorithms.
This is why it is necessary to understand how the algorithms function if you are serious about building your web site’s authority.
Understanding and properly utilizing the algorithms that search engines use is crucial to maintaining high page rankings on search engines.
There are several common metrics that search engines use to rank web sites.
These metrics include the number of page views, the time spent on each page, and the number of internal links associated with the domain name.
Other metrics that are commonly used include the number of external link sources, such as other web sites that reference the domain in question, the number of reciprocal links that exist for the domain, and the domain age.
Although some of these metrics are commonly used and understood, the exact nature of each metric will vary from one search engine to another.
As a result, it is important to understand how each metric, such as the Page Rank, Domain Authority, and the number of external link sources associated with the domain, may change over time in order to understand the relative importance of each metric to achieve a desirable high rank on the search engine ranking pages.
The most widely-used metric for measuring domain authority is the Page Rank, also known as PR.
This metric provides a quantitative measure of the quality and quantity of links that exist on a particular site. Other commonly used metrics include the average Page Score, which compare the quality of individual pages that link to the domain name, and the overall quality of the site as a whole.
Although Page Rank and the other metrics that measure domain authority are often seen as quantitative measures, they are actually qualitative measurements, which is what makes them helpful in determining domain link popularity.
Each link, be it a link to an internal page or external page on the domain, is counted as an incoming link to the domain, and each link that increases in Page Score is considered a vote for the domain.
This process of vote counting provides an accurate measure of link popularity, that can ultimately affect the Search Engine Rankings.
The number of reciprocal link sources associated with the domain is also taken into account when calculating domain authority.
Reciprocal linkages refer to the relationships established between any number of websites that link to a particular domain. The most valuable reciprocal relationships are the relationships that result in steady, long-term traffic, but these relationships do not always translate into high rankings with the Search Engines.
In order to qualify for high rankings with the Search Engines, a website must demonstrate steady, long-term domain authority.
Therefore, reciprocal linkages are used to demonstrate link popularity, and are included in the metric that measures SEO effort.
Another commonly-used metric for measuring link popularity is the link profile weight, which quantifies the effect that each link had on the overall score for that domain.
The link profile weight is simply the weighted average of the effect of all the links a domain has, rather than the total number of links.
The higher the weight, the more authority the domain has, and the more weight there is to the largest link on the site. Links that have reciprocal links, content, and informative articles have greater weight, while sites with only one link will score lower.
The final major role played by domain name weight is to quantify the relative value of the different domains that link to each other.
The relative value of domains is defined as the ratio of the total Page Score difference between them to the total Page Score difference between all the pages in the domain.
The higher this number, the greater the importance of that domain to the domain of another website. It is therefore calculated as the percentage of the overall Page Score difference between the two domains, divided by the total number of pages.
This is the domain authority percentage and is therefore a vital metric in the search engine optimization.