THE PERCENTAGE OF CONSONANTS CORRECT (PCC) METRIC - EXTENSIONS AND RELIABILITY DATA

Research in normal and disordered phonology requires measures of speec h production that ore biolinguistically appropriate and psychometrical ly robust. Their conceptual and numeric properties must be well charac terized, particularly because speech measures ore increasingly appeari ng in large-scale epidemiologic, genetic, and other descriptive-explan atory database studies. This work provides a rationale for extensions to an articulation competence metric titled the Percentage of Consonan ts 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 met rics, including the PCC. Discussion includes rationale for selecting o ne or more of the 10 metrics for specific clinical and research needs.