High Page Authority / Low Domain Authority

[NathanSchlink123]

I have been building links to the home page of my web site.  At this point, the site has a DA of 22 and the home page has a PA of 35.  I am a bit puzzled as to how the PA can be so much higher than DA.  I suppose it might have something to do with the fact that most of the inbound links are going to the home page.  Are there any other factors that might be contributing to this situation?  Does it point to a weakness in our backlink profile?

[MattRoney]

Billy is right, for all intents and purposes. It's VERY possible—even probable—that the authority difference is due to the bulk of your backlinks going to that page.

You can learn more about how authority is calculated here.

[Vizergy]

High high PA and lower DA is simply because the DA is an average of each page's PA (at least that's how I understand it).  It may not be quite that simple with certain page's weighing more in the average but I believe that is the simplest way to look at it.

In my personal market it is very hard, if not impossible to get links to any page other than the home page so I use very thought out internal linking structures to spread authority throughout the website.  However, I do not believe I have ever seen a website who's Home Page Authority was not considerably higher than the over all DA - for instance, the site I am working on right now has a DA of 59 and a PA (on the home page) of 65 while the PA of one of the internal pages is 43...