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This study provided empirical evidence of the validity of four vocabulary tests: Peabody Picture Vocabulary Test-III (PPVT-3), Expressive Vocabulary Test (EVT), Receptive One-Word Picture Vocabulary Test (ROWPVT), and Expressive One-Word Picture Vocabulary Test-Revised (EOWPVT-R) against a 150- utterance language sample for 28 normally-developing pre-school children. Systematic Analysis of Language Transcripts (SALT) standard scores on number of different words, total number of words, and mean length of utterance were used to provide evidence of convergent and discriminant criterion validity. Performance on the vocabulary tests showed significant weak to moderate correlations with the semantic measure, and the predicted lower relationship with the non-semantic measures. Despite this, individual score analysis showed considerable variation, indicating caution predicting conversational language performance from standardized tests.
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