Forum Moderators: DixonJones
The best representation of stickiness that I know of is really the average number of page views per visit and / or the length of time on average that a person stays on the site. Either way, you will need to track page views over time to do this.
Look for tracking systems that have "path analysis" built in to their systems. There is a significant list of systems in the tracking and logging forum's library.
Dixon.