8. A system, comprising: a memory device storing instructions; and one or more processors to execute the instructions to: determine, 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; determine, 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; determine an amount or rate of change between the first position and the second position; generate a third score for the document based on the determined amount or rate of change between the first position and the second position; and rank the document against at least one other document based on the third score.
14. The system of claim 8 , where when generating the third score for the document, the one or more processors are to: alter a relevancy score, associated with the document, that is based on a relevance of the document to a search query.