number of tokens for VOCD

[Gordana Hrzica]

Dear Brian,

thank you very much for your answer. I will try to get the hold of the book 
as soon as possible. And yes, I do need the measure for within-group 
comparison. I am also looking forward to MATTR.

Also, I am sorry if this is also explained somewhere else, but form the 
CLAN manual I did not understand exactly what are the replacements. I do 
understand (hopefully:) how the measure works, but not this part. I would 
really appreciate the explanation or maybe a reference.

Best,
Gordana


On Wednesday, 15 July 2015 18:30:34 UTC+2, Brian MacWhinney wrote:
>
> Dear Gordana,
>
>     You might want to double check the book by Malvern et al. on VOCD, but 
> I believe that the minimum value is set at 50 because results are unstable 
> for smaller files.  
>     We plan to implement another measure of lexical diversity called MATTR 
> (moving average TTR) that may be a bit better for your purposes.  Once it 
> is ready, I will post a note to ChiBolts about this.
>     One general point.  If all you care about is making within-group 
> comparisons, then using small transcripts is not a huge problem.  However, 
> if you were to attempt to compare lexical diversity numbers  from small 
> transcripts of the type you are describing with those with large 
> transcripts, then even VOCD would run into problems.
>
> —Brian MacWhinney
>
> On Jul 15, 2015, at 9:35 AM, Gordana Hrzica <gordana... at gmail.com 
> <javascript:>> wrote:
>
> Dear all,
>
> I would like to have a measure of vocabulary diversity in number of 
> transcripts of children's narratives. VOCD seems like the most reliable 
> choice for that and I would really like to use it. However, narratives are 
> rather small. Most of them is between 80 and 170 tokens, but some of them 
> are lower than 50. I know that default minimum value for calculating VOCD 
> is 50 tokens, but it can also be set lower. Also, I believe that using the 
> option of replacements would give me some results. However, I do not know 
> how reliable such results would be and which of the two mentioned methods 
> should give me more appropriate measures.
>
> I am sorry if I'm posting this to the wrong group. Perhaps it is more of a 
> methodological than a technical question. I feel it it somewhere between 
> two worlds:). But if it would be more appropriate for info-childes, I will 
> place it there.
>
> I would really appreciate your help on this one.
>
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