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Table 3 Prominent features used in the duration prediction model, ordered by their correlation with the duration of the chat. Unsurprisingly, the average duration of the agent and caller in previous calls is correlated with the duration of the current call

From: Machine-learning based routing of callers in an Israeli mental health hotline

Feature

Correlation

Agent average chat duration

0.178

Caller average chat duration

0.136

Agent’s number of chats in current shift

0.10

Agent average message length

0.09