In corpus linguistics building such megacorpora is beyond the scope of individual researchers , and they are not easily accessible ( Kennedy , 1998 : 56 ) unless the web is used as a corpus ( Kilgarriff and Grefenstette , 2003 ) .
introduction to the special issue on the web as corpus
A Kilgarriff G Grefenstette
Due to the Zipfian nature of word frequencies , around half the word types in a corpus occur only once , so tremendous increases in corpus size are required both to ensure inclusion of essential word and phrase types and to increase the chances of multiple occurrences of a given type . In corpus linguistics building such megacorpora is beyond the scope of individual researchers , and they are not easily accessible ( Kennedy , 1998 : 56 ) unless the web is used as a corpus ( Kilgarriff and Grefenstette , 2003 ) . Increasingly , corpus researchers are tapping the Web to overcome the sparse data problem ( Keller et al. , 2002 ) .
In corpus linguistics building such megacorpora is beyond the scope of individual researchers , and they are not easily accessible ( Kennedy , 1998 : 56 ) unless the web is used as a corpus ( @@CITATION ) .