Questions about CHIP

[Jenna]

Hello again, 

I am using the CHIP utility for a research project. I am interested in 
looking at how much mothers imitate and expand upon child utterances and 
whether that facilitates language development.

I have a few questions about some of the summary measures included in CHIP. 
I plan to use %_Overlap and %_EXPAN in my analysis, but I am not sure I 
understand Avg_Dist, Rep_Index, and %_IMITAT. These are the descriptions 
included in the manual:

“$DIST: the distance the response utterance is from the source”

“Avg_Dist: The sum of the DIST values divided by the total number of 
overlapping utterances.” 

“Rep_Index: Average proportion of repetition between the source and 
response utterance across all the overlapping responses in the data.” 

“%_IMITAT: ?? The numerator is the number of imitations and the denominator 
is ???”

My questions are: 


   1. How is distance measured? Is this how many utterances there are 
   between source and response?
   2. Is the Rep_Index how closely the source and response match (e.g. 3 
   out of 4 words match)?
   3. Does %_IMITAT measure percent of responses that exactly imitate the 
   source? What is the denominator?

Any further explanation you could provide on these measures would be very 
helpful. Thank you again for all of your help and for this wonderful 
program!
Jenna K. Poland
M.A Speech-Language Pathology Candidate, May 2015
Graduate Assistant to Nan B. Ratner, Ed.D 
University of Maryland, College Park 

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