Minimum LENA Hours: LENA provides percentile ranks for Adult Word Count and Conversational Turns for recodings that are at least 10 hours in duration. Therefore, the minimum number of hours of LENA hours should be 10 hours.
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Fernald, A., Zangl, R., Portillo, A. L., & Marchman, V. A. (2008). Looking while listening: Using eye movements to monitor spoken language comprehension by infants and young children. In I. A. Sekerina, E. M. Fernández, & H. Clahsen (Eds.), Developmental Psycholinguistics: On-line methods in children's language processing (pp. 97–135). Retrieved from http://psych.stanford.edu/~babylab/pdfs/LWL.2008.pdf
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Ford, M., Baer, C. T., Xu, D., Yapanel, U., & Gray, S. (2009). The LENA™ language environment analysis system: Audio specifications of the DLP-0121. Retrieved from http://www.lenafoundation.org/TechReport.aspx/Audio_Specifications/LTR-03-2
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Hart, B., & Risley, T. R. (1995). Meaningful differences in the everyday experience of young American children. Baltimore, MD: Paul H. Brookes.
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Hoff, E. (2003). The specificity of environmental influence: Socioeconomic status affects early vocabulary development via maternal speech. Child Development, 74(5), 1368–1378. doi:10.1111/1467-8624.00612
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Huttenlocher, J., Haight, W., Bryk, A., Seltzer, M., & Lyons, T. (1991). Early vocabulary growth: Relation to language input and gender. Developmental Psychology, 27(2), 236–248. doi:10.1037/0012-1649.27.2.236
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Kline, R. B. (2010). Principles and practice of structural equation modeling (3rd ed.). New York: Guilford Press.
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Marchman, V. A., & Fernald, A. (2008). Speed of word recognition and vocabulary knowledge in infancy predict cognitive and language outcomes in later childhood. Developmental Science, 11, F9–F16.
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Mirman, D. (2014). Growth Curve Analysis and Visualization Using R. Florida, USA: Chapman & Hall/CRC.
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Weisleder, A., & Fernald, A. (2013). Talking to Children Matters: Early Language Experience Strengthens Processing and Builds Vocabulary. Psychological Science, 24(11), 2143–2152. SAGE Publications. doi:10.1177/0956797613488145
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Williams, K. T. (2007). Expressive Vocabulary Test (2nd edition). Minneapolis, MN: Pearson Assessments.