69. The method of claim 68 further comprising calculating the DR value according to an equation comprising: DR = TW 3 TF + 1.
68. The method of claim 66 further comprising: determining a number of negated occurrences for the key term in each document at the negation module, the number of negated occurrences corresponding to a sum of the particular occurrences of the key term in each document where the at least one of the negation terms matches the other terms within the selected proximity of the particular occurrence of the key term; determining the term weight as a difference between the term frequency value and the number of negated occurrences; and determining the relevancy ranking value for each document at the ranking module as a document relevance (DR) value based on a ratio comprising the term weight (TW) value in a numerator of the ratio and the term frequency (TF) value in a denominator of the ratio.