5.4 MLT Analysis
The third analysis we will perform is to compute MLT (Mean Length of Turn) for both child and mother. Note that, unlike the MLU program, the CLAN program MLT includes the symbols xxx and yyy in all counts. Thus, utterances that consist of only unintelligible vocal material still constitute turns, as do nonverbal turns indicated by the postcode [+ trn] as illustrated in the following example:
*CHI: 0.[+ trn]
%gpx: CHI points to picture in book
We can use a single command to run our complete analysis and put all the results into a single file.
mlt *.cha > allmlt.cex
However, as far as we can see, with or without [+ trn] one gets the same results using the example provided in the manual (*CHI: 0.[+ trn]):
WITH TRN
> mlt @
mlt @
Fri Nov 13 09:37:51 2015
mlt (09-Sep-2015) is conducting analyses on:
ALL speaker tiers
****************************************
From file </Users/acristia/Dropbox/ANR_argentina/transcriptions/test.cha>
MLT for Speaker: *CHI:
MLT (xxx, yyy and www are EXCLUDED from the word counts, but are INCLUDED in utterance counts):
Number of: utterances = 1, turns = 1, words = 0
Ratio of words over turns = 0.000
Ratio of utterances over turns = 1.000
Ratio of words over utterances = 0.000
WITHOUT TRN (i.e., I removed [+ trn] from 0.[+ trn])
> mlt @
mlt @
Fri Nov 13 09:38:32 2015
mlt (09-Sep-2015) is conducting analyses on:
ALL speaker tiers
****************************************
From file </Users/acristia/Dropbox/ANR_argentina/transcriptions/test.cha>
MLT for Speaker: *CHI:
MLT (xxx, yyy and www are EXCLUDED from the word counts, but are INCLUDED in utterance counts):
Number of: utterances = 1, turns = 1, words = 0
Ratio of words over turns = 0.000
Ratio of utterances over turns = 1.000
Ratio of words over utterances = 0.000
Thank you all in advance for your help,
Alex Cristia--
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Total number of interventions
Number of verbal interventions
Number of verbal *linguistic* interventions
Number of verbal *non-linguistic* interventions
Number of non-verbal interventions
1 *CHI: 0.
2 *CHI: &baba .
3 *CHI: &baba .
4 *CHI: &baba .
5 *CHI: bat .
6 *CHI: baby .
mlt @
Number of: utterances = 6 --> A
mlt +a @
Number of: utterances = 2 --> Cmlt +s"&*" @
Number of: utterances = 3 --> D
And the rest of the numbers are derived from those 3:
B=C+D= 2+3 = 5
E=A-B=6-5=1
Dear Alex,
Yes, you are right. I made a test file out of your example and all the commands are correct. I will fix that mistake in the manual.
-- Brian