PageRank has long been the standard high-level metric used to identify the relative quality of a Web page. There is arguably limited value in using PageRank as a quality metric over the last few years, but it can still be meaningful in conjunction with other quality metrics (i.e. domain authority, page authority, etc.)
In 2013 a new quality metric will take the spotlight when it comes to page quality and search engine ranking. This metric is affectionately known as AuthorRank (or Agent Rank, according to Google’s patent).
Here’s why AuthorRank will help