9. A system for ranking relevance of parameters of a content item, the system comprising at least one processing circuit configured to: receive a plurality of parameters of a content item and a plurality of corresponding initial relevance scores of the parameters indicating relevance of the parameters to the content item; estimate, using a statistical model, a plurality of revised relevance scores from the initial relevance scores, wherein each of the revised relevance scores is a function of at least two of the plurality of initial relevance scores; and rank the plurality of parameters based on the revised relevance scores.
9. A system for ranking relevance of parameters of a content item, the system comprising at least one processing circuit configured to: receive a plurality of parameters of a content item and a plurality of corresponding initial relevance scores of the parameters indicating relevance of the parameters to the content item; estimate, using a statistical model, a plurality of revised relevance scores from the initial relevance scores, wherein each of the revised relevance scores is a function of at least two of the plurality of initial relevance scores; and rank the plurality of parameters based on the revised relevance scores. 13. The system of claim 9 , wherein the at least one processing circuit is further configured to: determine co-occurrences among the plurality of parameters; and prune the plurality of initial relevance scores as variables of the function.