Domain Authority why is change

[petrospan]

Hey seomoz friends!
I have a question and if you have some links to read about it, bring it on!!

What variables changes that measurement?

[TomRayner]

Hey Petros

From the SEOMoz guide to domain authority:

"We calculate this metric by combining all of our other link metrics (linking root domains, number of total links, mozRank, mozTrust, etc.) into a one single score."

What you should also consider is that each Mozscape update varies in size.  If we look at the last update, 70 billion URLs were crawled. The previous crawl looked at 68 billion and the one before that looked at 78 billion (that's a lotta links!)

With each different crawl being slightly different in size, there may be little fluctuations to your page authority and domain authority, even if your website and link profile hadn't changed a single bit between crawls.  Of course, if you have earned a number of high authority links to your domain, you can expect to see your domain authority go up.

Hope this helps, have a great weekend!

[Esaky]

Thank You for the Links ! 
Mine Increased PA  3pt and DA 3 pt on Dec 2012, recently noticed my PA is decreased by 1pt.

I am confused about the C-Blocks ? in The OSE, Internal inbound links internal Links ? the tip they show me - can't understand !

How to increase the C-blocks links to my domain, i have seen some blogs has large number of c-blocks - while Comparing them in OSE.

Mine is a design blog !