1. A computer-implemented method for identifying items in response to a query, comprising: under control of one or more computer systems configured with executable instructions, receiving a first query from a first user, the first query including one or more query terms; generating a first query result including one or more items corresponding to the first query; for each respective item in the first query result, determining a ranking value using one or more rating scores, each rating score corresponding to a respective query term and depending at least in part on a first frequency with which selection actions are performed by previous users with respect to the respective item, the selection actions being performed against previous query results generated in response to previous queries that include the respective query term; and presenting at least a portion of the first query result for display to the first user according to the ranking values.
1. A computer-implemented method for identifying items in response to a query, comprising: under control of one or more computer systems configured with executable instructions, receiving a first query from a first user, the first query including one or more query terms; generating a first query result including one or more items corresponding to the first query; for each respective item in the first query result, determining a ranking value using one or more rating scores, each rating score corresponding to a respective query term and depending at least in part on a first frequency with which selection actions are performed by previous users with respect to the respective item, the selection actions being performed against previous query results generated in response to previous queries that include the respective query term; and presenting at least a portion of the first query result for display to the first user according to the ranking values. 6. The computer-implemented method of claim 1 , wherein each rating score further depends at least in part on a position of the respective item in a webpage when a previous user performs a selection action with respect to the respective item.