3. The method of claim 2 , wherein determining, from the second search scores of the second resources, the second resource score for the query comprises: determining a first number of web page resources that include a second resource in the proper subset of second resources that has a corresponding second search score that meets second search score threshold; determining a second number of web page resources that include at least one of the second resources in the proper subset of second resources; and determining the second resource score based on a ratio of the first number to the second number.
3. The method of claim 2 , wherein determining, from the second search scores of the second resources, the second resource score for the query comprises: determining a first number of web page resources that include a second resource in the proper subset of second resources that has a corresponding second search score that meets second search score threshold; determining a second number of web page resources that include at least one of the second resources in the proper subset of second resources; and determining the second resource score based on a ratio of the first number to the second number. 5. The method of claim 3 , wherein the second search score is a topicality score that is a measure of topical relatedness of the second resource to the query.