Abstract: Clickstream data collected from a panel of internet users is used to generate and present internet activity metrics. Data collected from a community of internet users may be augmented by clickstream data store content, third party content, search results, and other sources to form estimates of internet activity, such as traffic, that is structured and analyzed to produce metrics of nearly any internet web site or domain. The estimate of the panel's Internet activity may be refined by applying a domain-specific bias adjustment to the estimate. Applying the domain-specific bias adjustment to the estimate may include applying a weight to a subset of the data that connotes a specific domain from the panel of Internet users.