17. The computer-readable storage medium of claim 12 , further comprising: assigning each of the plurality of document-query pairs to one of a plurality of second partitions according to length of the respective query of the document-query pair, each second partition being defined by a distinct respective length range.
17. The computer-readable storage medium of claim 12 , further comprising: assigning each of the plurality of document-query pairs to one of a plurality of second partitions according to length of the respective query of the document-query pair, each second partition being defined by a distinct respective length range. 18. The computer-readable storage medium of claim 17 , wherein determining the indication of quality of the website further comprises: aggregating the respective user feedback data associated with the document-query pairs in two or more of the second partitions; determining a distribution of aggregated user feedback data among the two or more second partitions; and determining the indication of quality of the website based on a combination of the first distribution and the second distribution.