VOCD is too high

[Nick Riches]

P.S. the Chapter is clearly copyrighted, so I'll order a copy of the book 
when it becomes available.

Nick

On Friday, April 15, 2016 at 10:18:27 AM UTC+1, Nick Riches wrote:
>
> Hi
>
> Many thanks for the help. I've just replied to Brian (above). It appears 
> that this is not a software issue, but one related to norms. The norms I 
> circulate are those in   Durán, P., Malvern, D., Richards, B., & Chipere, 
> N. (2004). Developmental Trends in Lexical Diversity. *Applied 
> Linguistics*, *25*(2), 220–242. http://doi.org/10.1093/applin/25.2.220. 
> But these give a much lower average D per age-band than your more recent 
> norms, which are obviously much more comprehensive.
>
> Thanks for the Chapter. I was wondering whether I could distribute it to 
> students, or whether it is subject to copyright?
>
> That's a great tip about using the variability in D to investigate 
> plagiarism. Sadly, I can't use it with our students as they collect their 
> own data...
>
> Best wishes
>
> Nick
>
> On Friday, April 15, 2016 at 2:24:11 AM UTC+1, Nan Ratner wrote:
>>
>> I didn't notice how old the child was, but I'd say Brian is right. In 
>> fact,
>> we just wrote an article together in which we took a look at language
>> sample analysis (LSA) metrics for a large number of kids in the Archive
>> talking with their mom or another adult (typical toy play scenarios) and 
>> we
>> definitely saw kids hit an "average" in that range between 4 and 6 years,
>> and the range definitely went that high well before that. As you know, the
>> problem with defining a real "norm" for VocD is its resampling algorithm
>> that won't give you exactly the same score twice, down to the decimal
>> point, but we are going to see if we can tackle this in the near future
>> statistically.
>> I am attaching a pdf of the article if you'd like to see our results. BTW,
>> I am glad to see someone using this kind of assignment. In case it helps
>> any other teachers out there, I kept the issue of VocD replicability to
>> myself until after the assignment was handed in, just to see if I could
>> spot people handing in one another's work, since for undergrads I gave 
>> them
>> a choice of only about a dozen taped interactions they could use to try
>> their hands at LSA. Over the years, I did catch just one pair of students.
>>
>> Nan
>>
>> On Thu, Apr 14, 2016 at 4:01 PM, Nick Riches <nick.... at gmail.com> wrote:
>>
>>> Hi
>>>
>>> I'm teaching CLAN to Speech and Language Therapy students. As an 
>>> exercise they have to calculate VOCD
>>>
>>> One student is consistently getting VOCD scores much higher than 70 (for 
>>> the VOCD program) and around 100 for KIDEVAL. This is a young child. I've 
>>> had a brief look and can't see anything odd about the coding that would 
>>> lead to these kind of results. I've attached the CHAT script, and the 
>>> MOR.PST.CEX scripts.
>>>
>>> Does anyone know why it's so high?
>>>
>>> Thanks in advance.
>>>
>>> Nick
>>>
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>>
>>
>>
>> -- 
>> Nan Bernstein Ratner,
>> Professor and Chairman
>> Dept. of Hearing and Speech Sciences
>> 0100 Lefrak Hall
>> University of Maryland
>> College Park, MD 20742
>> 301--405-4217
>> 301-314-2023 (fax) 
>>
>

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