Change in MozRank of the Target URL
This alert is based on the normalized (ten-point, logarithmically-scaled) MozRank of the paid-level domain of the source URL (Moz Documentation). Changes in MozRank are generally associated with a shift in the link popularity score for a domain, and is often compared with Google’s PageRank scoring. This metric compares the authority of your domain with all other websites indexed by Moz.
Increase in MozRank of the Target URL
An increase in MozRank for your target URL indicates an increase in overall ranking authority for your webpage. This is a good indicator that your site is increasing the number of inbound links (external and internal) contributing to the overall authority of your website.
Decrease in MozRank of the Target URL
If the MozRank for your domain is decreasing, that typically indicates you are losing links and authority for your target URL. If you see this number dropping, you should pay close attention to ensure that you have not noindexed authority pages of your site, or recently lost a number of authoritative links.
Let’s hope you have recently garnered new authoritative links to your site and you see this number on a steady upward trend. It is important to note that Moz can trigger false positives for this alert if there was a recent index update on their end, which would have an impact on the MozRank of all sites in their index. If you see a big jump or drop, you should check to see if Moz updated their index before freaking out!