***** To join INSNA, visit http://www.sfu.ca/~insna/ ***** Hi all, I'm stuck on the precise measures to use when identifying brokers in resource exchange networks when adopting a structural holes approach. Burt (2003) advises using a Constraint index when looking at brokers of innovation and "good ideas" and this seems possible when essentially the discussion centres around idea diffusion. However, I'm interested in identifying brokers of essential resources within organisations (e.g. advice, support, material) and in this scenario the constraint measure on its own appears to be more of a dependence measure - which may be useful to identify "peripheral" or highly dependant actors but own it's own doesn't help to identify brokers highly regarded due to their ability to span "structural holes". The redundancy measure (or network efficiency) is particularly attractive as few other measures (e.g. flow-betweenness, degree, Bonacich's power) appear to acknowledge this point. However, it seems limiting to use Efficiency on its own as the definition of a structural hole incorporates (among others) both Constraint and Redundancy. I am trying to identify a measure capable of being used for hypothesis testing (e.g. actors change acceptance is dependant on the change affecting their brokerage positions) so a single index would be useful to say the least. So, two questions. 1. Is there a mechanism available that provides a single index for the identification of those occupying brokerage roles by spanning structural holes (i.e. a combination of constraint, redundancy, hierarchy, density etc.) 2. Has anyone used single index indicators (e.g. Redundancy on its own) to identify brokers in a resource exchange scenario and how successful was it ? Thanks all, hopefully I've clearly explained my thinking ! Cheers, Glen. Glen D. Murphy PhD Candidate Work Effectiveness Research Program School of Management Faculty Of Business Queensland University of Technology Ph. 07 3314 8061 Mob. 0403 001 623 _____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.sfu.ca/~insna/). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.