What is the logarithmic scale used for domain authority?

[garypropellernet]

I want to quantify how much better a score of 80 is compared to 60.

Or 60 compared to 30 etc....

What is the logarithm base?

Thanks,

Rik

[Jeepster]

Have you looked here?
http://www.seomoz.org/learn-seo/domain-authority

[Dr-Pete]

It turns out to be a bit complicated, since DA/PA are based on a machine-learning algorithm. Dr. Matt Peters, our resident data scientist, answered a similar question here:

https://seomoz.zendesk.com/entries/22546573-domain-page-authority-logarithmic