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# Table 3 Description of features, grouped by class, showing if they were used in the **size** prediction regression model, the **node** placement classifier, or **both**

From: On the challenges of predicting microscopic dynamics of online conversations

Feature | Task | Description |
---|---|---|

Global | ||

Current size | Node | Number of nodes and its log |

Depth | Both | Conversation depth and its log |

Root edges | Size | Percentage of edges connected to the root |

Recent edges | Size | Percentage of edges connected to the most recent node (the last one) at each insertion |

Parent delay | Size | Mean and median parent delay of nodes (cf. “Structural features” section) |

Node | ||

Node index | Node | Time-ordered index of given node |

Node depth | Node | Depth of given node |

Node parent delay | Node | Parent delay of given node (cf. “Structural features” section) |

Subtree size | Node | Size of subtree of given node |

#Children | Node | Number of children of given node |

#Grandchildren | Node | Number of grandchildren of given node |

#Siblings | Node | Number of siblings of given node |

#Cousins | Node | Number of cousins of given node |

#Uncles | Node | Number of uncles of given node |

(mean and median over conversations initiated by the user)
User | ||

Max breadth | Node | Maximum breadth |

Depth | Node | Conversations depth |

\(1{\text {st}}\) Breadth | Node | Number of comments at the first level (depth=1) |

Lifetime | Node | Conversation lifetime in seconds |

Size | Node | Number of nodes in a conversation tree |

Root edges | Node | Percentage of edges connecting to the root |

Recent edges | Node | Percentage of edges connecting to the most recent node (the last one) at each insertion |

#Posts | Node | Total number of posts by user |

Content | ||

Root text | Both | Title of the Reddit post or Twitter text embedded in a 25-component vector |

Temporal | ||

Response time | Size | Mean and median time between replies |

\(1{\text {st}}\) Response Time | Size | Time between root post and first reply |

Root time of day | Both | Time of day of root post |

Root day of week | Both | Day of week of root post |