In the case of missing articles, we notice that results in the two comparison corpora are similar, and are much lower than in the requirement corpus.
determination errors in general account for 24.1 % (student essays) and 15.8 % (scientific papers) of all errors in the two comparison corpora, indicating that authors produce a more varied range of determination errors in these types of writing than in requirements, where determination errors other than missing articles are marginal to non-existent.