Does the Anchor Text has to be unique?

[ritesh3592]

There is no necessity for anchor text to be unique. It does not help your page rank. Google only uses it as a way to understand what is on the page linked to.
It will neither affect the link juice or any other aspect of SEO.
It only gives Google the idea of the content on the page. Nothing more than that.
Regards.

How can you say that it does not help page rank? Do you have any statistics? Because I have witnessed for such scenario that putting exact unique keyword help me to improve the ranking of my website. Although  I also support that relevant anchor text helps too but it does not mean that unique anchor text has no importance!!