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Page Authority is a proprietary metric calculated by SEOmoz to assess the likely ranking strength of a specific, single web page as measured by Google. The focus is an individual web page. The metric is calculated using a complex algorithm. In general terms, the algorithm is based on the Linkscape web index and includes a range of other variables such as link counts, mozRank and mozTrust. The algorithm is dynamic in that it constantly changes by comparing predicted rankings with actual rankings and updating the algorithm parameters accordingly.
Domain Authority
Whereas PA assesses the likely Google ranking of a single web page, DA measures the likely ranking strength of an entire domain or sub-domain, similar to MozRank and MozTrust.
DA, like PA, is also is based on a complex, dynamic algorithm. It can be measured using tools such as Open Site Explorer or the SEP toolbar called MozBar provided free by the SEOmoz, the well-known provider of SEO software.
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