bilingual data collection

[Janna]

Dear Bill, Kim, Barbara, and Meiyun,

I also share your excitement about studies of bilingual acquisition
and the use of the LENA system. I want to point out, though, that the
LENA system is most reliable and valid with very very long (day-long)
samples. We tested the system with mother-child samples that were 30
minutes long and did not get the levels of reliability and validity
that are needed for a scientific study. This is not to say that the
LENA system does not have value for its intended purposes----just be
careful and do the necessary reliability and validity checks if you
planned to use the system for samples that are shorter than 10+ hours.
I'll be happy to send you our article on LENA if you want this.

Janna Oetting
Louisiana State University

On Jan 1, 9:31 am, Brian MacWhinney <m... at cmu.edu> wrote:
> Dear Bill, Kim, Barbara, and Meiyun,
>
>     I share with you the excitement about studies of bilingual acquisition.  I also imagine that the use of the Lena recording system may be of some value in this process.  However, it also seems to me that each of you should consider the possibility of collecting your data in a way that would allow it to be accessible to other researchers.  I think that bilingual researchers such as Virginia Yip and Stephen Matthews, Annick De Houwer, Margaret Deuchar, Fred Genesee, Madalena Cruz-Ferreira, Miquel Serra, Petra Bos, Jeroen Aarsen, Juana Liceras, Raquel Fernandez, Mariko Hayashi, Tania Ionin, Astrid Klammler, Magda Krupa-Kwiatowska, Judit Navracsics, Antje Van Oosten, and Charles Watkins have set a good example for others by sharing their transcripts and, in many cases their audio recording through the CHILDES database system.  The Yip-Matthews corpus is a recent and particularly impressive example of how this can be done and the impact it can have on our understanding of childhood bilingualism.  Perhaps each of you would consider also contributing; your data to the field using this method.
>
> -- Brian MacWhinney, CMU

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