VOCD is too high

Fri Apr 15 14:43:05 UTC 2016

Nick,
    Yes, the norms Nan extracted for that article are going to be the gold standard of the future.  The plan is to incorporate these norms directly into the KIDEVAL program.   Soon ….

—Brian

From: ChiBolts <chibolts at googlegroups.com<mailto:chibolts at googlegroups.com>> on behalf of Nick Riches <nick.riches at gmail.com<mailto:nick.riches at gmail.com>>
Reply-To: ChiBolts <chibolts at googlegroups.com<mailto:chibolts at googlegroups.com>>
Date: Friday, April 15, 2016 at 5:13 AM
To: ChiBolts <chibolts at googlegroups.com<mailto:chibolts at googlegroups.com>>
Cc: Nick Riches <nick.riches at newcastle.ac.uk<mailto:nick.riches at newcastle.ac.uk>>
Subject: Re: VOCD is too high

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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