8. The method of claim 7 , wherein the F-measure for the query, category pair is calculated in accordance with the expression: F ⁢ - ⁢ measure ⁡ ( query , category ) = P ⁡ ( query , category ) ( a × P ⁡ ( category ) + ( 1 - a ) × P ⁡ ( query ) ) , where P(n) denotes a probability of occurrence in the prior query data, and ‘a’ is a predefined variable for balancing recall and precision.
9. The method of claim 8 , wherein ‘a’ is within the range of approximately 0.7 to 0.9.