VOCD is too high

[Nick Riches]

Dear Brian

Thanks for getting back so quickly. I've just checked, and KIDEVAL is 
consistent with VOCD. Apologies - the student reported a difference, and I 
should have triple-checked before posting.

Regarding VOCD, I've been using the norms provided 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. This seems to be the most recent 
published source of norms on D, but I may be wrong. According to these, a D 
score of 70 would put a child aged 6 years old in the 90th centile. 
However, according to the norms which Nan sent through in the 2016 article 
"Your laptop to the rescue", a D score of 70 is about average for this age. 
I presume that these recent norms are more comprehensive. So the issue is 
not the accuracy of the software, but where to obtain a good set of norms 
to interpret VOCD.

It would be great if I could circulate this chapter to the students, but it 
may be subject to copyright. I could also develop my own norms, but my CLAN 
skills are not quite up to scratch (just yet!)

Best wishes

Nick Riches


On Thursday, April 14, 2016 at 9:58:44 PM UTC+1, Brian MacWhinney wrote:
>
> Dear Nick,
>       Looking at the file you sent, the VOCD score seems about right, 
> because this child was using a lot of different words.  Just by way of 
> comparison,  I ran VOCD on the various files in the Brown/Eve file and Eve 
> got higher and higher scores as Eve got older.  Everything seemed fine. 
>  Leonid checked on the issue you mention about KIDEVAL giving different 
> values from a separate run of VOCD and he could not see problems there 
> either.  
>      
> —Brian MacWhinney
>
> From: ChiBolts <chib... at googlegroups.com <javascript:>> on behalf of Nick 
> Riches <nick.... at gmail.com <javascript:>>
> Reply-To: ChiBolts <chib... at googlegroups.com <javascript:>>
> Date: Thursday, April 14, 2016 at 4:01 PM
> To: ChiBolts <chib... at googlegroups.com <javascript:>>
> Subject: VOCD is too high
>
> 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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