calculating subject-verb diversity in CLAN

[Brian Macwhinney]

Dear Risa,
    Leonid can write some code to do this.  However, I think it would be useful to make sure that people are tracking subject-verb diversity in a well-defined and consistent manner.  People in Pam Hadley’s lab at Illinois considered this quite important based on work Hadley, McKenna, and Rispoli reported in 2018 in AJSLP.  Is this what you are trying to compute?  We have already worked a bit with Pam’s lab on this and it would be best to make sure that we implement ways of doing this consistently.

— Brian MacWhinney
Teresa Heinz Professor of Cognitive Psychology, 
Language Technologies and Modern Languages, CMU 

> On Oct 9, 2023, at 3:19 PM, Risa Stiegler <rstiegle at purdue.edu> wrote:
> 
> Hello!
> 
> I am trying to calculate the number of unique subject-verb combinations (the subject verb diversity) in a child's speech.  
> 
> I'm able to use combo to find each instance of a child's utterance that has a subject and a verb (or participle):
> 
> combo +t*CHI +d7 +sg|SUBJ^*^m|part+m|v +g6 *.cha
> 
> I have 2 questions:
> 1) how can I exclude utterances that are marked with $RT on the %spa tier? (In order to exclude sentences where the child is directly imitating adult speech.)
> 
> 2) Is there a way to take the output of this combo command and create a list of just the subject-verb combinations and their frequencies?  The combo command outputs the main, mor, and gra tiers, and marks the subject and verb:
> *CHI: a baby is swimming .
> %mor⇔%gra: det:art|a⇔1|2|DET (1)n|baby⇔2|4|SUBJ aux|be&3s⇔3|4|AUX
> (1)part|swim-presp⇔4|0|ROOT .⇔5|4|PUNCT
> 
> It would be great if CLAN could go through and pull "baby swim" instead of having a human do it.
> 
> I saw in the 2023 CHILDES update that you are working on calculating SVD automatically, so if there is a better way to do it than what I've come up with I would love to hear it!
> 
> Thank you so much!
> Risa Stiegler
> 
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