Contrasting accounts of the common structure in the blockmodels for two community elites (Breiger and Pattison, 1978; McConaghy, 1980) are shown to follow from two distinct means of interpreting the semigroup representation of role structure in a single population. The two candidate sets of...

We contend that clusters of cases co-constitute statistical interactions among variables. Interactions among variables imply clusters of cases within which statistical effects differ. Regression coefficients may be productively viewed as sums across clusters of cases, and in this sense...

One of the "hottest" concepts in international academic social-science research, social capital refers to the ways in which people make use of social networks in "getting ahead". This book presents the latest contributions and advances in theory and method in this important...