Errtum re: CDI norming database now publicly available

[Philip Dale]

The name of longtime CDI Advisory Board member Donna Jackson-Maldonado was inadvertently left off the Board list in my earlier message; corrected here with my apologies.

Philip Dale

 

MacArthur-Bates Communicative Development Inventory norming database now publicly available

The norming study for the CDI instruments was one of the first large-sample studies of early language development. The data have proven highly useful for both clinical and research purposes. There have been two primary formats for those data. The norms provided in the Fenson, Marchman, Thal, Dale, Reznick & Bates (2007) MacArthur-Bates Communicative Development Inventories: User's Guide and Technical Manual – Second Edition aggregate across words (or grammatical items, or gestures) to provide a reliable and valid index of individual children's development relative to their gender and age. Alternatively, data can be aggregated across children for individual words, grammatical items, or gestures to provide information on the development of individual items. These data are available on the CLEX website http://www.cdi-clex.org  along with comparable data from an ever-growing set of other languages (10 to this point). However, for still other research questions, investigators will need data at the most basic level, that is, responses for individual children on individual items. On a number of occasions we have made the entire dataset available to researchers on an individual basis, but we realize that others might find it of use now, and in the future.

For this reason, and to mark the 25th anniversary of the work of the CDI Advisory Board, we have decided to place the entire norming dataset in the public domain, in the CHILDES system.  This dataset, available in both SPSS and Excel formats, is that used for the 2007 revised User's Guide and Technical Manual, and is expanded relative to the original dataset, with the goal of being more representative of the population of the US. The total sample size is 2550 children. Users should read carefully the relevant section of the User's Guide (pp 50-56) to understand exclusion criteria, measures, and other issues for defining appropriate samples. The files may be found at http://childes.psy.cmu.edu/tools/CDI/ 

We are especially pleased to take this step in honor of the memory of our colleague, friend and inspiration Elizabeth Bates. Liz was deeply committed to the public exchange of instruments, data, theories and ideas. We hope that the availability of these data will contribute to ongoing discussions and development of our understanding of early language development.

The CDI Advisory Board

Larry Fenson, Chair

Dorthe Bleses

Philip Dale

Donna Jackson-Maldonado

Virginia Marchman

Judy Reilly

J. Steven Reznick

Donna Thal

 

 

 

 

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