Use of utterance-initials back-channels as a percentage of utterances
The Student parts (A) and the Teacher parts (B) add up to the duet percentage of the conversation.

Generally, the Teacher is more likely than the Student to initiate an utterance using a back-channel word.

qry duet rates per speaker and overall................................................................................Teacher rate
Duet rate
..dialog
#utterances
Student back channels
Student rate
Teacher's back channels
65.00%
RS2Npst8
20
1
5.00%
12
60.00%
62.96%
LE2Npst8
27
3
11.11%
14
51.85%
50.00%
DC2Npst8
20
6
30.00%
4
20.00%
46.15%
Recast-s
13
1
7.69%
5
38.46%