Advantages of page tagging

The main advantages of page tagging over logfile analysis are as follows:
Counting is activated by opening the page (given that the web client runs the tag scripts), not requesting it from the server. If a page is cached, it will not be counted by the server. Cached pages can account for up to one-third of all pageviews. Not counting cached pages seriously skews many site metrics. It is for this reason server-based log analysis is not considered suitable for analysis of human activity on websites.

Data is gathered via a component ("tag") in the page, usually written in JavaScript, though Java can be used, and increasingly Flash is used. Ajax can also be used in conjunction with a server-side scripting language (such as PHP) to manipulate and (usually) store it in a database, basically enabling complete control over how the data is represented.

The script may have access to additional information on the web client or on the user, not sent in the query, such as visitors' screen sizes and the price of the goods they purchased.

Page tagging can report on events which do not involve a request to the web server, such as interactions within Flash movies, partial form completion, mouse events such as onClick, onMouseOver, onFocus, onBlur etc.

The page tagging service manages the process of assigning cookies to visitors; with logfile analysis, the server has to be configured to do this.

Page tagging is available to companies who do not have access to their own web servers.
Lately page tagging has become a standard in web analytics

Reference By: en.wikipedia.org/wiki/Web_analytics#On-site_web_analytics_technologies

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Logfile analysis vs page tagging

LogFile analysis programs and page tagging solutions to both web analytics that companies are easily available. In some cases, the same web analytics company will offer both approaches. The question then should choose a company that is causing the system. Each approach has advantages and disadvantages.

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Web Page tagging

LogFile accuracy analysis in the presence of caching, and other data collection method, page tagging or 'Web bugs' leads to an outsourced service, web analytics as a desire to be able to worry about

Web analytics service during his visit and subsequent visits to uniquely identify the user to manage the process of assigning a cookie.

Third party data storage server (or even an in-house data storage server), using the Web site to determine the IP address of the server to store the data collected from the user's computer to the DNS look-up is required. On occasion, a successful delay or failure to complete DNS look-ups can result in data not being collected.

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