The DATA collection consists of three archives. The Demographics Archive provides diagnostic and case information for 280 children with functional phonological disorders. The Experimental Archive summarizes the conditions of clinical treatment and corresponding performance of children who were enrolled in experimental training studies. The Developmental Phonologies Archive consists of the longitudinal records from each of 280 children in production of probe words that sampled target English singletons, onset and coda clusters. Each archive includes downloadable Excel files, ReadMe file with instructions, and reference files that are not manipulable so as to preserve the integrity of the data in perpetuity and also to allow the user a crosscheck for accuracy.

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