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Get flash to fully experience Pearltrees
http://awstats.sourceforge.net/ AWStats is a free powerful and featureful tool that generates advanced web, streaming, ftp or mail server statistics, graphically . This log analyzer works as a CGI or from command line and shows you all possible information your log contains, in few graphical web pages . It uses a partial information file to be able to process large log files, often and quickly. It can analyze log files from all major server tools like Apache log files (NCSA combined/XLF/ELF log format or common/CLF log format), WebStar, IIS (W3C log format) and a lot of other web, proxy, wap, streaming servers, mail servers and some ftp servers.

AWStats - Free log file analyzer for advanced statistics (GNU GPL).

http://www.usablestats.com/index.php

Tutorials, Calculators, Consulting and Statistics Help

Variability is a fundamental concept in statistics. This tutorial covers the standard deviation and why measuring variability is so important. Fundamentals of Statistics 1: Basic Concepts If you know nothing about statistics, this is the place to start. The tutorial covers basic concepts such as the mean, standard deviation, populations and sample statistics. Fundamentals of Statistics 2: The Normal Distribution
Visualization tools use a variety of methods to show you where users are clicking on the individual pages of your Web site to help you make design adjustments that emphasize the right links and content. Indextools – Provides web-based analytics package featuring real-time reporting. The Path Explorer feature provides a visual overlay of how users are behaving on your site. http://mashable.com/2007/06/25/analytics-toolbox/

Analytics Toolbox: 50+ Ways to Track Website Traffic