15th lecture of the Fred Jelinek Seminar series
The linguistics researcher or language technologist often wonders
“what corpus should I use, or should I build one of my own? If I build one of my
own, how will I know if I have done a good job?” Currently there is very little
help available for them. They are in need of a framework for evaluating corpora.
We develop such a framework, in relation to corpora which aim for good coverage
of ‘general language’. The task we set is automatic creation of a
publication-quality collocations dictionary. For a sample of 100 headwords of
Czech and 100 of English, we identify a gold standard dataset of (ideally) all
the collocations that should appear for these headwords in a collocations
dictionary. We then use them to determine precision and recall for a range of
corpora, with a range of parameters.