Title
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How to measure the onset of babbling reliably?
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Author
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Abstract
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Various measures for identifying the onset of babbling have been proposed in the literature, but a formal definition of the exact procedure and a thorough validation of the sample size required for reliably establishing babbling onset is lacking. In this paper the reliability of five commonly used measures is assessed using a large longitudinal corpus of spontaneous speech from forty infants (age 0 ; 6−2 ; 0). In a first experiment it is shown that establishing the onset of babbling with reasonable (95%) confidence is impossible when the measures are computed only once, and when the number of vocalizations are not equal for all children at all ages. In addition, each measure requires a different minimal sample size. In the second experiment a robust procedure is proposed and formally defined that permits the identification of the onset of babbling with 95% confidence. The bootstrapping procedure involves extensive resampling and requires relatively few data. |
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Language
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English
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Source (journal)
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Journal of child language. - London, 1974, currens
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Publication
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London
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2012
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ISSN
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0305-0009
[print]
1469-7602
[online]
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DOI
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10.1017/S0305000911000171
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Volume/pages
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39
:3
(2012)
, p. 523-552
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ISI
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000303892100003
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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