isnar: Introduction to Social Network Analysis with R

#' Pattern of sexual contacts in AMEN study
#'
#' Contact layer of the mixing matrix of men and women in US based on "Aids in
#' Multi-Ethnic  Neighborhoods" (AMEN). Based on Newman (2003).
#'
#'
#' @docType data
#' @name Catania
#'
#' @format
#' Four-by-four numeric matrix with dimnames.
#' 
#' \preformatted{
#'           woman
#' man        black hispanic white other
#'   black    0.258    0.016 0.035 0.013
#'   hispanic 0.012    0.157 0.058 0.019
#'   white    0.013    0.023 0.306 0.035
#'   other    0.005    0.007 0.024 0.016
#' }
#'
#' @source
#' Newman, M. (2003) "Mixing patterns in networks" Arxiv:cond-mat/0209450 v2
#'
#' @references
#'
#' Catania et al. (1992) "The population-based AMEN (AIDS in Multi-Ethnic
#' Neighborhoods) study" American Journal of Public Health 82, 284-287
#'
#' Morris, M. (1995) "Data driven network models for the spread of infectious
#' disease". In D. Mollison (ed.) "Epidemic Models: Their Structure and
#' Relation to Data", pp. 302-322, Cambridge University Press, Cambridge
#'
#' Newman, M. (2003) "Mixing patterns in networks" Arxiv:cond-mat/0209450 v2
#'
#' @examples
#' data(Catania)
#' 
#' # assortativity 
#' ep <- sum(Catania %*% Catania)
#' ( sum(diag(Catania)) - ep ) / ( 1 - ep )
NULL