When to use page rank?when not to use page rank?

Use page rank:

• Rough indication of crawl new “link” property.
• For relevancy.
• Can be useful for components of other metrics.
• History can be useful.

Do not use page rank for :

• Understanding SERPs ranking.
• Evalulating link prospects.
• Reporting as key metric.

Page rank is for pagaes only ,it is not for domain pages.