Should I use Google Analytics from the SEO aspect?
Summary:
Matt's answer:
The answer is no. Webspam does not use Google Analytics. And a while ago I went and checked and search quality in general, does not use Google Analytics in ranking. So you can use Google Analytics, you cannot use Google Analytics.
It won’t affect your ranking within Google search results
Now just to cover, in case you’re very curious, one tiny corner case, which is: what if my site was very very slowly and adding Google Analytics just barely tipped me over the edge to where my page or my site looked like it loaded very slowly? And the answer to that is also good. Google Analytics has recently introduced new asynchronous JavaScript code, that you can introduce, you can add on to your page, and it will wait and load up that JavaScript after the toolbar unload event.
So even if you’re worried about, well what if Google Analytics might slow my page down a little bit, they’re actually on the cutting edge of having good JavaScript that won’t affect the load time for users, and us could know in no way effect your search engine results either.
It should be completely safe to add Google Analytics
Whether you’re tracking your e-commerce, or if you’re just looking at the sort of searches that people use to show up on your site. Uh that data is not currently used in any way, shape or form, to the best of my knowledge, as of today May 17, 2010, in Google search results. So I hope that puts your mind at ease.
by Matt Cutts - Google's Head of Search Quality Team