Sample Size Effects on Temporal Reliability of Language Sample Measures of Preschool Children

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97 citations0/0 files storedJournal of Speech Language and Hearing Research

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Language Development and Disorders Voice and Speech Disorders Child and Animal Learning Development

Abstract

The present study examined the temporal reliability of four quantitative measurements of operationally defined linguistic behaviors observed in a naturalistic setting. The measures of language production were computed using the Systematic Analysis of Language Transcripts (SALT) software from two 20-minute language samples obtained 3 to 14 days apart for each of 20 preschool-aged children. Samples were edited to different sizes based either on duration (12 or 20 minutes) or on limits of the total number of complete and intelligible utterances (from 25 to 175 in increments of 25). Inadequate reliability was found for the language sample measure, total number of words; hence, the validity of this measure is questionable. In contrast, very high temporal reliability coefficients (r > .92) were obtained for the language sample measures of number of different words, mean length of utterance in morphemes, and mean sentence length in morphemes when derived from a large number (> or = 175) of complete and intelligible utterances. The temporal reliability of these measures reached acceptable levels, not only for research purposes, but for diagnostic purposes as well.

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References

1979Assessment in special and remedial education 1978Assessment in special and remedial education 1972Educational and Psychological Measurement and Evaluation 1981The Relation between Age and Mean Length of Utterance in Morphemes 1988Language disorders and language development 1976The grammatical analysis of language disability 1981Assessing Language Production in Children: Experimental Procedures 1995Measuring Children’s Lexical Diversity: Differentiating Typical and Impaired Language Learners

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