1. A method comprising: determining, by one or more server devices and at a first time, a first position of a document with respect to a first set of documents in a first list of search results, the first position being based on a first score of the document with respect to one or more scores associated with the first set of documents in the first list of search results; determining, by at least one of the one or more server devices and at a second time, a second position of the document with respect to a second set of documents in a second list of search results, the second position being based on a second score of the document with respect to one or more scores associated with the second set of documents in the second list of search results, determining, by at least one of the one or more server devices, an amount or rate of change between the first position and the second position; generating, by at least one of the one or more server devices, a third score for the document based on the determined amount or rate of change between the first position and the second position; and ranking, by at least one of the one or more server devices, the document against at least one other document based on the third score.
1. A method comprising: determining, by one or more server devices and at a first time, a first position of a document with respect to a first set of documents in a first list of search results, the first position being based on a first score of the document with respect to one or more scores associated with the first set of documents in the first list of search results; determining, by at least one of the one or more server devices and at a second time, a second position of the document with respect to a second set of documents in a second list of search results, the second position being based on a second score of the document with respect to one or more scores associated with the second set of documents in the second list of search results, determining, by at least one of the one or more server devices, an amount or rate of change between the first position and the second position; generating, by at least one of the one or more server devices, a third score for the document based on the determined amount or rate of change between the first position and the second position; and ranking, by at least one of the one or more server devices, the document against at least one other document based on the third score. 3. The method of claim 1 , where determining the amount or rate of change includes: determining a rate at which the document moves between the first position and the second position, and where generating the third score for the document includes: generating the third score based on the determined rate.