| 摘要 |
Methods and systems for selecting and serving an ad to a Web page in response to an ad request from that page, where the ad being delivered has the highest or close to the highest expected value, are described. The prior history of an ad is examined and the circumstances relating to the ad that have led to a positive action for the ad in the past (such as a click on the ad by a user) are determined. This data are collected and stored in a first set of data. In addition, the characteristics of the ad request are examined. A likelihood function is used to derive a likelihood value which can be used to lead to a probability that the ad will be successful or have a positive result. Following this process, a group of Web pages is created that have shown a positive result when the ad was displayed. The creation of the group of Web pages results from executing one or more custom targeting engines. In addition, a group of ad requests for the ad that provided a positive result for the ad and another group of ad requests that did not provide a positive result for the ad are created. An ad is selected and served to the Web page based on a comparison of the ad request with these two groups of ad requests.
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