15. The system of claim 14 , the instructions further comprising a ranking score module configured to determine, for each of the item listings that satisfies the query, a ranking score based, a least in part, on the weighted sums of the predicted listing quality score and the observed listing quality score for the item listing.
16. The system of claim 15 , the instructions further comprising a presentation module configured to present the item listings that satisfy the query in accordance with the ranking scores.