Material Detail

An open database of parent-report data from the MacArthur-Bates Communicative Development Inventories (CDIs), covering children's early vocabulary and grammar across many languages. Interactive tools let users view vocabulary growth norms by age and demographic group, track when individual words are learned, and compare trajectories across languages. Data are free to explore and download under a CC BY 4.0 license. Students can use it to test claims about language development with real data from very large samples.

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