A couple of the primary metrics that we use in Long Tail Pro is Page Authority and Domain Authority.  These are value provided and calculated by SEOmoz.org.

However, if you are not familiar with what these values are; this is meant to be a quick tutorial.

What is Page Authority?

Long Tail Pro use the Page Authority value on the competitor analysis screen.  You can find it here in this screenshot:

According to SEOmoz, Page Authority is:

Page Authority predicts the likelihood of a single page to rank well, regardless of its content. The higher the Page Authority, the greater the potential for that individual page to rank well in search results.

How is Page Authority Scored?

We score Page Authority on a 100-point, logarithmic scale. Thus, it’s easier to grow your score from 20 to 30 than it would be to grow from 70 to 80. We constantly update the algorithm used to calculate Page Authority, so you may see your score fluctuate from time to time.

Overall, Page Authority is a score between 1 and 100 that tells you how “authoritative” a page is.  If you ever forget this definition, you can simply hover over the column header in the software to get a re-fresher:

According to SEOmoz, Domain Authority is:

Domain Authority is SEOmoz’s calculated metric for how well a given domain is likely to rank in Google.com’s search results. It is based off of the Linkscape web index and includes link counts, mozRank, mozTrust, and dozens more. It uses a machine learning model to predicatively find an algorithm that best correlates with rankings across thousands of search results that we predict against.

How is Domain Authority Scored?

We score Domain Authority on a 100-point, logarithmic scale. Thus, it’s easier to grow your score from 20 to 30 than it would be to grow from 70 to 80.

And if you are looking for the difference between Domain Authority and Page Authority, here you go:

Domain Authority vs. Page Authority

Whereas Domain Authority measures the predictive ranking strength of entire domains or subdomains, Page Authority measures the strength of individual page. The same is true for metrics such as MozRank and MozTrust.

If you ever forget what domain authority is, you can also just hover over the column to get a refresher.

Overall, these metrics are very important for determining the overall strength of individual ranking pages or domains.  Page Authority is specifically used heavily in the calculation of keyword competitiveness.  To get a better idea of how keyword competitiveness is calculated, you can read my previous post here.

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