The “Adjektivkongruens” project investigates the incidence of singular vs. plural endings on adjectives that agree with collective nouns in Norwegian, as in: Politiet var sikker (singular) vs. sikre (plural) på at mannen var død ‘The police was/were sure that the man was dead’. The possible predictor factors that are investigated are the distance between the noun and the adjective, the semantic category of the substantive (geopolitical, political party, police, etc.), the status of the adjective as an ordinary qualitative adjective or a participle, and whether or not the adjective is part of a larger grammatical construction (for example with a prepositional phrase).
R, R version 4.1.0 (2021-05-18) -- "Camp Pontanezen"