VOCD

Thu Aug 20 18:07:19 UTC 2015

Nan asked about MATTR in child samples. I just used MATTR for the first
time and found it more sensitive than VOCD to group differences in
school-aged children. Some of the samples were too brief for VOCD
calculations, so it was handy to have a tool that can be used with shorter
narratives.

Jamie

On Thu, Aug 20, 2015 at 12:54 PM, Nan Bernstein Ratner <nratner at umd.edu>
wrote:

> A colleague and I found VOCD to correlate with standardized vocabulary
> profiles much better than TTR did:
>
>
>
> Silverman, S (Now Stacy Wagovich). and Ratner, N. (2002). Measuring
> lexical diversity in children who stutter: application of vocd. *Journal
> of Fluency Disorders, 27* (4), 1-16.
>
>
>
> In our ongoing work, with adults who stutter, multiple aspects of
> expressive language use differ from that seen in typically fluent speakers;
> TTR does not reveal anything, but our adults who stutter speak much less.
> VOCD is showing statistical differences between the groups. Amanda is
> right, VOCD is impacted by sample size, but not as much. It will be
> interesting to see how MATTR compares, especially for use with child
> language or smaller samples. Has anyone out there tried it for child
> samples?
>
>
>
> It will be interesting to try to derive ‘norms” for VOCD, since it is
> essentially an estimate, and you won’t get EXACTLY the same value twice. In
> fact, that’s how I know if my students are doing their own CLAN assignments
> J
>
>
>
>
>
> N
>
>
>
>
>
> Nan Bernstein Ratner, Fellow, ASHA; Fellow, AAAS
>
> Board Certified Specialist-Child Language
>
> Professor
>
> Department of Hearing and Speech Sciences
>
> University of Maryland
>
> 0100 Lefrak Hall
>
> College Park, MD 20742
>
> 301-405-4217, 301-314-2023 (fax)
>
> nratner at umd.edu
>
>
>
> http://hesp.umd.edu/facultyprofile/Bernstein%20Ratner/Nan
>
>
>
> Director, University of Maryland Autism Research Consortium (UMARC)
>
> Participating Faculty, Neuroscience and Cognitive Science (NACS)
>
> Research Faculty, Maryland Language Science Center
>
> Participating Faculty, Developmental Science
>
>
>
> *From:* chibolts at googlegroups.com [mailto:chibolts at googlegroups.com] *On
> Behalf Of *Amanda Owen Van Horne
> *Sent:* Thursday, August 20, 2015 9:31 AM
> *To:* chibolts <chibolts at googlegroups.com>
> *Subject:* Re: VOCD manual
>
>
>
> Also see
>
>
>
> Owen, A. J., & Leonard, L. B. (2002). Lexical Diversity in the Spontaneous
> Speech of Children With Specific Language ImpairmentApplication of D.*Journal
> of Speech, Language, and Hearing Research*, *45*(5), 927-937.
>
> Bottom line is that VOCD is better than TTR, but less transparent.  It
> does still vary with sample size, but to a lesser degree.
>
>
>
> McCarthy, P. M., & Jarvis, S. (2010). MTLD, vocd-D, and HD-D: A validation
> study of sophisticated approaches to lexical diversity assessment. *Behavior
> research methods*, *42*(2), 381-392.
>
> Compares various methods of computing D.  Recommends  a variety of
> measures.
>
>
>
> Koizumi, R. (2012). Relationships between text length and lexical
> diversity measures: can we use short texts of less than 100 tokens. *Vocabulary
> Learning and Instruction*, *1*(1), 60-69.
>
> Recommends MLTD
>
>
>
>
>
> On Wednesday, August 19, 2015 at 9:46:58 AM UTC-5, Amber wrote:
>
> In fact, perhaps I should just post my question on here. The CHAT manual
> talks about calculating D and states that it can be done on samples as
> small as 50 tokens. However, reliability is less good for small samples.
> Could anyone advise me on whether VOCD is still a more valid measure than
> TTR, even for small transcripts (e.g., during a shared-book reading
> session)? I assume that as long as the sample is large enough for KIDEVAL
> to be able to give me VOCD values then it is OK?
> Thanks
> Amber
>
> On Wednesday, 19 August 2015 15:36:05 UTC+1, Amber wrote:
>
> Dear all
>
> The CLAN manual contains the following link, which no longer appears to
> work.
>
> http://childes.psy.cmu.edu/manuals/vocd.doc
>
> Is there a new link to the VOCD manual/another similar article?
>
> Many thanks
> Amber
>
> --
> You received this message because you are subscribed to the Google Groups
> "chibolts" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to chibolts+unsubscribe at googlegroups.com.
> To post to this group, send email to chibolts at googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/chibolts/ae7fc0ce-464b-4792-83ce-15aa689d722d%40googlegroups.com
> <https://groups.google.com/d/msgid/chibolts/ae7fc0ce-464b-4792-83ce-15aa689d722d%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
> For more options, visit https://groups.google.com/d/optout.
>
> --
> You received this message because you are subscribed to the Google Groups
> "chibolts" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to chibolts+unsubscribe at googlegroups.com.
> To post to this group, send email to chibolts at googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/chibolts/78F7051232E584458D81A07B6C78AF7D0140A2D1%40OITMX1008.AD.UMD.EDU
> <https://groups.google.com/d/msgid/chibolts/78F7051232E584458D81A07B6C78AF7D0140A2D1%40OITMX1008.AD.UMD.EDU?utm_medium=email&utm_source=footer>
> .
> For more options, visit https://groups.google.com/d/optout.
>

-- 
You received this message because you are subscribed to the Google Groups "chibolts" group.
To unsubscribe from this group and stop receiving emails from it, send an email to chibolts+unsubscribe at googlegroups.com.
To post to this group, send email to chibolts at googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/chibolts/CAGhax0DBKdM70-i5gM06%3DkzQ23EhbF__Fox4cNUGdF05pxovMQ%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listserv.linguistlist.org/pipermail/chibolts/attachments/20150820/5f719cd3/attachment.htm>