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Last modified: 9/1/2010
Below you will find various reasons why the numbers for client side data collection will never match the numbers resulting from log file analysis.
Traditional log analysis counts hits from web server log files; client side analysis counts users (identified by cookies) and HTML pages viewed from browsers.
Proxy Servers and Page Caching
With log file analysis, pages cached by proxy servers may not be counted; with client side, all page views are counted (each page view contains a random number that prevents proxy servers from caching it).
Downloads and non-HTML Pages
With client side, only viewable HTML pages can be counted (.html, .htm, .asp, etc.); log file analysis software can be configured to count all downloads and links to non-HTML files.