If you have a website, you should have at least one type of analytics software installed, and that analytics software ought to be Google Analytics. It is an incredibly full-featured web analytics solution, and best of all, it is completely free. In fact, it’s even better than most of the paid solutions out there. Google Analytics provides a wealth of data, and it is actually quite easy to use.
The Google Analyticator plugin makes it easy to integrate Google Analytics on your WordPress website. It offers some extremely useful features, most notably a 30-day account snapshot and the ability to exclude your logged in users from your traffic data.