There appears to be no official plugin that allows you to pass parameter variables to your WordPress scripts, but if you are happy to hand-craft a little php code yourself, change a template file and upload some code to your plugins folder then you can check out this solution to pass variable parameters to your WordPress scripts.
Understanding Google Analytics: The Pros, Cons, and Alternatives
Google Analytics is a free, powerful web analytics tool, but do you need it? Are there any alternatives? What implications are there for privacy?
