27. The system of claim 26 , where the keyword/category associator is further to calculate the score based on an equation that includes: Score = P ⁡ ( keyword , category ) ( a · P ⁡ ( keyword ) + ( 1 - a ) · P ⁡ ( category ) , where a is a constant factor between 0 and 1, P(keyword) is a probability associated with the search query frequency, P(category) is a probability associated with the document frequency within one of the categories a category, and P(keyword, category) is the joint probability associated with the search query frequency and the document frequency within the one of the categories.
26. The system of claim 24 , where keyword/category associator is further to: use the search query frequency and the document frequency to calculate a score for the keyword candidate, and associate the keyword candidate is with the at least one category when the score exceeds a score threshold.