Visitor Session for International, Unknown, and the United States summarize the origin of visitors in percentages of hits. Georgraphic location is logged in the User Domain field. How it is reported is determined by the Domains tab in the Options window. Visitors - A count of unique IPs for the period of the report, whether or not they were authenticated using domain names or cookies. Persistant cookies are defined in Cookies tab in the Options window.
Cookies give the most accurate count.
Who Visited Once - A count of visitor sessions that occurred only once throughout the log file. Once - The count of visitor sessions that appeared more than once in the log file. By default a visitor session is 30 minutes. The General Stats table gives a general overview of the Web site's performance and your visitor's behavior, helping you quickly assess areas to address. It can determine the report chapters to focus on for valuable site enhancement statistics.