POLAR Statistics - php Referrer Stats is advanced, light-weight, php based website statistics software.

Features include:
Graphing
Search term collection, sorted by search engine
Ability to view todays search terms
Collection of non-search engine referrals
Individual page view statistics
Daily statistics
Monthly Statistics
Host Viewer
Total visits per host
Advanced Archiving
Period Averages
Bounce rate estimation (will be greatly improved in future release)
New visitor percentage
Pages per visit estimation
Stats viewer password protection
Weekly email with snapshot stats and link to full stats

System Requirements
PHP 4.3+
MySQL Database

Installation
1) Uncompress the archive, upload Polar Statistics
2) Perform a basic configuration by modifying ‘polarstats_config.php’ to your liking.
3) Run the INSTALL.php script to setup the databases.
4) Include the monitoring script on any page you would like to track statistics on. The page must be parsed by your php engine which usually requires the code to be placed in php tags and have a file name with .php as the extension. Use the following code to include the monitor:
include ‘polarstats/polarstats_monitor.php’;

More detailed installation instructions are included in the README.