# dyad.census

From igraph v0.6.5-2
by Gabor Csardi

##### Dyad census of a graph

Classify dyads in a directed graphs. The relationship between each pair of vertices is measured. It can be in three states: mutual, asymmetric or non-existent.

- Keywords
- graphs

##### Usage

`dyad.census(graph)`

##### Arguments

- graph
- The input graph. A warning is given if it is not directed.

##### Value

- A named numeric vector with three elements:
mut The number of pairs with mutual connections. asym The number of pairs with non-mutual connections. null The number of pairs with no connection between them.

##### concept

Dyad census

##### References

Holland, P.W. and Leinhardt, S. A Method for Detecting
Structure in Sociometric Data. *American Journal of Sociology*, 76,
492--513. 1970.

Wasserman, S., and Faust, K. *Social Network Analysis: Methods
and Applications.* Cambridge: Cambridge University Press. 1994.

##### See Also

`triad.census`

for the same classification, but with triples.

##### Examples

```
g <- ba.game(100)
dyad.census(g)
```

*Documentation reproduced from package igraph, version 0.6.5-2, License: GPL (>= 2)*

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