22. The document cluster ranking system of claim 17 , wherein the processor is further configured to: obtain a value associated with a second feature for each of a plurality of document clusters; based on the values associated with the second feature, automatically generate, for each of a plurality of second feature bins, a range of values and a bin identifier to define each of the plurality of second feature bins, and wherein obtaining a score for one of the document clusters further comprises: identifying the second feature bin having a range of values which includes the obtained value associated with the second feature for that one of the document clusters; and determining the score for that document cluster based on the bin identifier for the identified second feature bin.
22. The document cluster ranking system of claim 17 , wherein the processor is further configured to: obtain a value associated with a second feature for each of a plurality of document clusters; based on the values associated with the second feature, automatically generate, for each of a plurality of second feature bins, a range of values and a bin identifier to define each of the plurality of second feature bins, and wherein obtaining a score for one of the document clusters further comprises: identifying the second feature bin having a range of values which includes the obtained value associated with the second feature for that one of the document clusters; and determining the score for that document cluster based on the bin identifier for the identified second feature bin. 23. The document cluster ranking system of claim 22 , wherein the score for the document cluster is determined based on a weighted sum of bin identifiers for identified bins.