***** To join INSNA, visit http://www.insna.org ***** Hi, I am working on a project that looks at the factors affecting partner selection in a multi-partner alliance. As a start I'd like to find a workable approach for the formation of triads. My data set comprises 3-party alliances formed over 10 years between 87 firms. The conventional approach would call for the calculation of the corresponding risk set (all 3-party alliances that could have formed). Now this would mean 87*86*85*10/6 = a painfully large number. I have been looking at matched samples but I wanted to ask whether anybody out there has tackled a similar problem successfully. Any help is greatly appreciated! Cheers, Ralph Ralph A. Heidl Box 353200 University of Washington Seattle, WA 98195 office: 206 685 2748 mobile: 206 412 3888 email: [log in to unmask] _____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.insna.org). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.