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Yes there is but there was an update this weekend that lowered the value of exact match domains (emd) and partial match domains (pmd)

Hi there, This is Megan from the SEOmoz help team.  Sorry that your rankings are looking off in your campaign. I'm not sure why you would be getting different results in the campaign rankings than you would be getting when you run the searches yourself; it could be a lot of things. The search engines - Google, Yahoo! & Bing - all maintain multiple indices that run across multiple datacenters. This means if you query different datacenters, you can get somewhat different ranking results. Other elements, such as personalization, geography and search history (even if you're logged out of your Google/search engine account) can also influence ranking positions. Hence, there can be a lot of variation in what different people, searching from different computers/locations might see in the rankings. Our solution has been to run searches from a variety of IP addresses and IP blocks using non-personalized, search history/location agnostic requests. In our experience, these have provided the most accurate results, showing what the "most" users see, though we know there's still quite a bit of room for fluctuation. If you have any other questions or would like us to look specifically at your campaign, feel free to send us a message at help@seomoz.org Cheers, Megan