However , since work in this direction has started , a significant progress has also been made in the research on statistical learning of full parsers , both in terms of accuracy and processing time ( Charniak , 1997b ; Charniak , 1997a ; Collins , 1997 ; Ratnaparkhi , 1997 ) .
a linear observed time statistical parser based on maximum entropy models
A Ratnaparkhi
Overall , the driving force behind the work on learning shallow parsers was the desire to get better performance and higher reliability . However , since work in this direction has started , a significant progress has also been made in the research on statistical learning of full parsers , both in terms of accuracy and processing time ( Charniak , 1997b ; Charniak , 1997a ; Collins , 1997 ; Ratnaparkhi , 1997 ) . This paper investigates the question of whether work on shallow parsing is worthwhile .
However , since work in this direction has started , a significant progress has also been made in the research on statistical learning of full parsers , both in terms of accuracy and processing time ( Charniak , 1997b ; Charniak , 1997a ; Collins , 1997 ; @@CITATION ) .