For languages which have agreement both within clauses and within NPs, if clause-constituents agree in Number, NP constituents are very likely also to agree in Number.
Standardized
Whenever there is agreement both within clauses and within NPs, IF clause-constituents agree in number, THEN NP constituents are very likely also to agree in number.
1. 82.5% of languages in Plank’s sample have agreement both within clauses and within NPs. 2. Cf. #1064.