US Patent 8645198 Evaluating advertising strategies by simulating their application

A facility for evaluating an advertising strategy with respect to a subject website is described. The facility receives a specification of the advertising strategy. The specification indicates how to apply the advertising strategy to select one of a plurality of advertising campaigns in response to each page request against the subject website. The facility applies the advertising strategy in accordance with the received advertising strategy specification to a sequence of page requests earlier received against the subject website. The facility then assesses the results of applying the advertising strategy in accordance with the received advertising strategy specification to the earlier-received page requests.