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Wordbank: an open repository for developmental vocabulary data*



The MacArthur-Bates Communicative Development Inventories (CDIs) are a widely used family of parent-report instruments for easy and inexpensive data-gathering about early language acquisition. CDI data have been used to explore a variety of theoretically important topics, but, with few exceptions, researchers have had to rely on data collected in their own lab. In this paper, we remedy this issue by presenting Wordbank, a structured database of CDI data combined with a browsable web interface. Wordbank archives CDI data across languages and labs, providing a resource for researchers interested in early language, as well as a platform for novel analyses. The site allows interactive exploration of patterns of vocabulary growth at the level of both individual children and particular words. We also introduce wordbankr, a software package for connecting to the database directly. Together, these tools extend the abilities of students and researchers to explore quantitative trends in vocabulary development.


Corresponding author

Address for correspondence: Michael C. Frank, Department of Psychology, Jordan Hall (Bldg. 420), 450 Serra Mall, Stanford, CA 94305; tel: (650) 724-4003; e-mail:


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This work supported by a John Merck Scholars award and NSF BCS-1528526. Thanks to Ranjay Krishna for contributions to the initial development of the site, to Rune Nørgaard Jørgensen for helping port data from CLEX, to all of the contributors listed at <> for generously sharing their data, and to the Advisory Board of the MacArthur-Bates Communicative Development Inventories, especially Philip Dale and Larry Fenson, for their support.



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Wordbank: an open repository for developmental vocabulary data*



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