No AccessJournal of Speech, Language, and Hearing ResearchResearch Article1 Aug 1997

The Percentage of Consonants Correct (PCC) Metric

Extensions and Reliability Data

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University of Wisconsin-Madison

The Phonology Project, Waisman Center on Mental Retardation and Human Development, University of Wisconsin-Madison, 1500 Highland Avenue, Madison, WI 53705

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Diane Austin

University of Wisconsin-Madison

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Barbara A. Lewis

The Phonology Project, Waisman Center on Mental Retardation and Human Development, University of Wisconsin-Madison, 1500 Highland Avenue, Madison, WI 53705

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Jane L. McSweeny

University of Wisconsin-Madison

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and

David L. Wilson

University of Wisconsin-Madison

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https://doi.org/10.1044/jslhr.4004.708

Research in normal and disordered phonology requires measures of speech production that are biolinguistically appropriate and psychometrically robust. Their conceptual and numeric properties must be well characterized, particularly because speech measures are increasingly appearing in large-scale epidemiologic, genetic, and other descriptive-explanatory database studies. This work provides a rationale for extensions to an articulation competence metric titled the Percentage of Consonants Correct (PCC; Shriberg & Kwiatkowski, 1982; Shriberg, Kwiatkowski, Best, Hengst, & Terselic-Weber, 1986), which is computed from a 5- to 10-minute conversational speech sample. Reliability and standard error of measurement estimates are provided for 9 of a set of 10 speech metrics, including the PCC. Discussion includes rationale for selecting one or more of the 10 metrics for specific clinical and research needs.

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