Determining the probability that a user or program fraudulently initiated a web-page request is described herein. A data-mining component is configured to determine attributes associated with the web-page request. A computation component is configured to calculate a probability that the web-page request was fraudulently initiated. To calculate this probability, the attributes and other parameters are fed into a statistical model. An auction component is configured to locate one or more advertisements to display on the web page based on the probability. The auction component may also be configured to restrict the advertisements for display based on advertiser-specified target criteria.
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