This blog post is a bit of fun that might give you some idea of the sorts of thing that cannot be tracked by your web analytics system…
1. Odysseus Off-Site
This intrepid traveller ranges far and wide across the internet but has so far resisted the siren call of your site. People like this are very interesting for online marketers especially if they represent your target demographic but you will not find out anything about them from your onsite analytics. Service like Hitwise or Google Ad Planner can give you information about where on the internet Odysseus is hanging out.
2. Henry In-a-Hurry
Henry decides very quickly if he wants to continue looking at a web page. If your analytics code hasn’t loaded by the time he clicks a link or presses the back button then his pageview will not be recorded. The new Google Analytics Asynchronous code will improve tracking of Henry In-a-Hurry.
3. Nadia No-Script
4. Christopher Cookie-Eater
Who stole the cookies from the cookie jar? Christopher just can’t bear to leave all those cookies just sitting on his hard drive so he eats/deletes them at the end of every browsing session. Chris will be tracked but he will seen as a new visitor even if he visits your site everyday.
5. Deborah Disabled-Cookies
6. Thomas Tin-Foil-Hat