Comparing these results with the results in Tables 1 and 2, we find that while overall the performance of contextual non-combined feature sets shows a small performance increase over most non-contextual combined or non-combined feature sets, there is again a slight decrease in performance across the best results in each table.
adaBoost's best accuracy of 84.75% is achieved on the "alltext+speech+glob-ident" combined feature set.