Domain authority (DA) and Page authority (PA) in particular are two factors that you should always consider, apart from relevance, before choosing a domain for backlinking. DA and PA are the new PageRank (PR itself is an outdated SEO metric now and should not be considered).
You can calculate the DA of a domain by simply installing the MOZ SEO toolbar. Research shows that DA is a crucial component of Google ranking algorithm (there are more than 200 ranking factors)
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