Competitive Domain Analysis.. Can anyone explain this

[MeteorElec]

As you can see from the following 3 images below that 3 out of 4 companies have declined in Domain Authority however one has managed to actually increase and stay up. Can anyone explain how this may be for the company that has stayed up has lost total external followed link and has only increased linking C-block domains by 1

uLTyDWz,QvBCoka,xT1rsod#2 uLTyDWz,QvBCoka,xT1rsod#1 uLTyDWz,QvBCoka,xT1rsod#0

[EGOL]

Before you invest in a product you could get some information.

Lots of people post generic description of products / services here and members will provide their opinions about them.   We will tell you if the box is full of crap or gold.

[MeteorElec]

But if that was the case why spent money each month on a product was is then to be considered useless every month as i am to only check it every 4-5 months?

Like i get your point of guessing the weight of the box but each person that holds that box will have a better estimate of the weight yes? So in the same way each site will have a better estimate of DA?

[EGOL]

I think that domain authority is something that you might check (for your own sites) about once every six months  and feel good if the number is going up.

I think that looking at the domain authority of potential competitors might be a useful thing to do if you are considering a new area of competition and want to get some idea about how much mojo is over there.

But, really... its kind of like picking up a box and guessing the weight.   Its about that kind of accuracy.  That kind of metric has value but I don't think that it is a good use of your time to be checking it, plotting it, worrying about it.

Spend time working on your website to make it a lot better and domain authority will take care of itself.  I can't tell you the DA of my sites.  I look at it as stated above.

[MeteorElec]

So basically what your saying is that it is no big deal if any of the companies have decreased that it is an ongoing part of SEO as it will often fluxuate in line with the Google Algorithm?

[EGOL]

Here is the SEOmoz explanation for domain authority.  You can read it and speculate.

http://www.seomoz.org/learn-seo/domain-authority

Anyone who answers is speculating.