Tracking Subdomains
One of the most important things to consider when trying to set up Google Analytics for your site is the integrity of your visitors' source/medium data. Keeping this data as accurate as possible will go a long way to helping you make useful decisions about your marketing efforts.
That being said, there is a silent enemy threatening to destroy the harmony of your Google Analytics data: the self-referral. You may first see it rear its ugly in head in the All Traffic Sources report. Not only is it rather disconcerting to see your own site as a visitor's referrer, but this entry in your reports represents irrevocably lost data. What's worse, you may even notice that the conversion rate for this segment of traffic is actually quite good. You may be putting lots of time and money in SEO, paid online adversing, e-mail campaigns and print ads, but when someone asks which of these was responsible for the conversion, you really don't know. Some of those sources may be getting overwritten by your self-referrals.
If your site has subdomains (domain.com and blog.domain.com, for instance), this might be causing the self-referrals to show up in your reports. The standard Google Analytics Tracking code is only good for sites with a single domain and no other structural complications. Anything beyond this and you'll need to make some kind of modification to the script. Subdomains are one such complication.
Whenever a visitor comes to your site, the Google Analytics Tracking Code on your pages asks the visitor's browser a question:

If you've been following this blog, you've likely heard several references to the
Google Analytics allows you to create numerous filters. So how do you know which ones you need to implement for your site? Well, one you might want to explore is a lowercase filter. So what is a lowercase filter and what precisely does it do? 






