In order for any data to be logged, the Web analytics module must be enabled in Site Manager -> Settings -> On-line marketing -> Web analytics.
To provide the most accurate statistics, it is recommended to place the web part on a page that most visitors will pass through, such as the website's default page or a frequently used landing page.
Please note that this web part utilizes JavaScript, which may in some cases interfere with other scripts on the page.
Help URL: http://devnet.kentico.com/docs/webparts/index.html?AnalyticsBrowsercapabilities_overview.htm