For my research I need to compare one set of agreement patterns in American and British English. So would anyone know of two corpora (one for American English, the other for British English) that would have sufficiently close collection procedures for the hits they return to be compared (ie. for possible differences in proportion to be considered meaningful)?? Ideally I am looking for contemporary English, but if the data are a bit older, it is not a problem.
Many thanks in advance for any help with this!