# 18 Table of Common ERGM Terms

For full list, in R type: `help("ergm-terms")`

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Name | Unit of counting | Description | Num. of statistics | Dep/ind | Dir/undir | Unip/bip |
---|---|---|---|---|---|---|

edges | edges | number of edges | 1 | ind | both | both |

nodefactor | units of the attribute | number of times that nodes with a given level of a categorical nodal attribute appear within the edgeset | 1 per level of attribute included | ind | both | both |

nodematch | edges | number of edges whose incident nodes match on value of nodal attribute | if diff=F, 1; if diff=T, 1 per level of attribute included | ind | both | both |

nodemix | edges | number of edges whose incident nodes fall into each combination of values for a nodal attribute | 1 per combo of attribute included | ind | both | both |

nodecov | units of the attribute | the sum of a nodal attribute value for the incident nodes of an edge, summed across all edges | 1 | ind | both | both |

absdiff | units of the attribute | the absolute difference in a nodal attribute between incident nodes for an edge, summed across all edges | 1 | ind | both | both |

mutual | dyad | number of mutual edges (a->b and b->a) | 1 | dep | dir | both |

degree | node | number of nodes of degree x | 1 per each value of x included | dep | undir | unip |

idegree | node | number of nodes of in-degree x | 1 per each value of x included | dep | dir | unip |

odegree | node | number of nodes of out-degree x | 1 per each value of x included | dep | dir | unip |

b1degree | node | number of mode 1 nodes of degree x | 1 per each value of x included | dep | undir | bip |

b2degree | node | number of mode 2 nodes of degree x | 1 per each value of x included | dep | undir | bip |

mindegree | node | number of nodes of at least degree x | 1 per each value of x included | dep | undir | unip |

triangles | triangles | number of triangles | 1 (more if attributes used) | dep | undir | unip |

gwesp | complex | geometrically weighted edgewise shared partners | 1 | dep | both | unip |

Notes:

- Dep/indep = A term involving statistical dependence or independence among relations
- Dir/undir = works for directed and/or indirected networks
- Unip/bip = works for unipartite and.or bipartite networks#