Why a big difference between PR and mR

[TrevorJones]

Hi seomozzers

I have a question regarding metrics on a site I am looking at. Basically the homepage has the following:

DA 33, PA41

mR 5.09, mT 5.84

PR 1

I have also checked an internal page and that has similar mozrank and moztrust and PA 37 but has PR 0.

Can anyone shed any light on the possible reasons (other than a Google penalty) why there should be such a difference between PR and mR as I understood that in general the difference is more likely to be 0.5 to 1. As I do not believe that the site has had any 'help' from black hat tactics and is 9 years old I'm a little perplexed.

Anyone else experience such a discrepancy?

Thanks in advance.

Trevor

[AdamThompson]

Trevor,

One possible explanation is that their PageRank doesn't reflect recent changes (since the public number I only updated about once a quarter).

For a difference that large, though, I would strongly suspect that Google is discounting some of their inbound links that SEOmoz isn't.

[TrevorJones]

Hi Adam

Thanks for the prompt reply. Yes, I agree that such a large difference I assume must be down to Google filtering out link juice from large amounts of links as I can't think of any other reasons.

The site has 40k links from 140 root domains and I'm not aware of any prior linkbuilding except a natural one over the years.

Will be checking out the link profile anyway so will be looking for anything dodgy!

Thanks again

[AdamThompson]

"40k links from 140 root domains"

Sounds like a bunch of sitewide links...maybe Google is discounting them more heavily than SEOmoz.

[TrevorJones]

Hi Adam Yes, I replied too quickly before putting my brain in gear! Will sift through the data and take a closer look. Thanks again