For the normalized entropy measure, the fixed effect of within-episode position is insignificant for initiators, which means there is neither increase nor decrease, and is reliably positive for responders (Switchboard, β = 1.4 × 10 −2 , p < 0.001; BNC, β = 1.2 × 10 −2 , p < 0.001).
it can be seen that entropy drops at the beginning of topic episode, and then increases within the episode.