assortnet (version 0.20)

assortment.continuous: Assortment on continuous vertex values

Description

Calculates the assortativity coefficient for weighted and unweighted graphs with numerical vertex values

Usage

assortment.continuous(graph, vertex_values, weighted = TRUE, 
			SE = FALSE, M = 1, na.rm = FALSE)

Value

This function returns a named list, with two elements:

$r the assortativity coefficient $SE the standard error

Arguments

graph

A Adjacency matrix, as an N x N matrix. Can be weighted or binary.

vertex_values

Values on which to calculate assortment, vector of N numbers

weighted

Flag: TRUE to use weighted edges, FALSE to turn edges into binary (even if weights are given)

SE

Calculate standard error using the Jackknife method.

M

Binning value for Jackknife, where M edges are removed rather than single edges. This helps speed up the estimate for large networks with many edges.

na.rm

Remove all nodes which have NA as vertex_values from both the network and the vertex_values object. If this is False and NAs are present, an error message will be displayed.

Author

Damien Farine [e-mail]

References

Newman (2003) Mixing patterns in networks. Physical Review E (67) Farine, D.R. (2014) Measuring phenotypic assortment in animal social networks: weighted associations are more robust than binary edges. Animal Behaviour 89: 141-153.

Examples

	# DIRECTED NETWORK EXAMPLE
	# Create a random directed network
	N <- 20
	dyads <- expand.grid(ID1=1:20,ID2=1:20)
	dyads <- dyads[which(dyads$ID1 != dyads$ID2),]
	weights <- rbeta(nrow(dyads),1,15)
	network <- matrix(0, nrow=N, ncol=N)
	network[cbind(dyads$ID1,dyads$ID2)] <- weights

	# Create random continues trait values
	traits <- rnorm(N)
	
	# Test for assortment as binary network
	assortment.continuous(network,traits,weighted=FALSE)
	
	# Test for assortment as weighted network
	assortment.continuous(network,traits,weighted=TRUE)
	
	
	
	# UNDIRECTED NETWORK EXAMPLE
	# Create a random undirected network
	N <- 20
	dyads <- expand.grid(ID1=1:20,ID2=1:20)
	dyads <- dyads[which(dyads$ID1 < dyads$ID2),]
	weights <- rbeta(nrow(dyads),1,15)
	network <- matrix(0, nrow=N, ncol=N)
	network[cbind(dyads$ID1,dyads$ID2)] <- weights
	network[cbind(dyads$ID2,dyads$ID1)] <- weights
	
	# Create random continues trait values
	traits <- rnorm(N)
	
	# Test for assortment as binary network
	assortment.continuous(network,traits,weighted=FALSE)
	
	# Test for assortment as weighted network
	assortment.continuous(network,traits,weighted=TRUE)