***** To join INSNA, visit http://www.sfu.ca/~insna/ ***** Geographers (and George Barnett) have been doing this sort of stuff for years. Jim Simmons, now retired from Toronto Geography, did intercity phone calls 25 years ago; Johan Galtung (ok, not a geog) did intercity airline flights also a while back; George has been playing with a lot of connectivity data. There's also a huge city centrality lit. I haven't tracked the lit, so don't ask me, but I am sure that it exists and should be checked before people charge off to do new stuff. And I would be interested in the question of does distance matter in Internet contact? As compared to Phone and F2F? My highly scientific (;-)) study of 12 Berkely grad students in 24 hours use of the net showed that 57% of their emails were within Berkeley. Many of the rest were from their hometowns (carrying the neighborhood with them). Barry ___________________________________________________________________ Barry Wellman Professor of Sociology NetLab Director [log in to unmask] http://www.chass.utoronto.ca/~wellman Centre for Urban & Community Studies University of Toronto 455 Spadina Avenue Toronto Canada M5S 2G8 fax:+1-416-978-7162 ___________________________________________________________________ On Thu, 17 Oct 2002, Valdis wrote: > Date: Thu, 17 Oct 2002 20:35:19 -0400 > From: Valdis <[log in to unmask]> > To: [log in to unmask] > Subject: Re: SV: city centrality > > ***** To join INSNA, visit http://www.sfu.ca/~insna/ ***** > > How about travel volume between cities [adjusted for city size?] as a tie indicator? > Even if you limited it to just airline traffic... > > Or phone traffic... area code to area code? > > Valdis > > > > Carl Nordlund wrote: > > > > Yep, this is one of the many research bulletins published by GaWC and the > > people around Peter Taylor. But as can be read in this particular report: > > > > "This model can be formally represented by a matrix Vij defined by n cities > > x m firms where vij is the 'service value' of city i to firm j. Service > > value is the importance of a city to a firm's office network which depends > > upon the size and functions of an office or offices in a city. Thus every > > column denotes a firm's global strategy and every row describes each city's > > mix of services. Using this matrix, elementary network analyses can be > > conducted of the world city network. For instance, a city's network > > connectivity can be defined as the sum of the products of its service values > > with every other city's service values." > > > > And this is indeed an artificial way of fetching structural data > > (connectivity data above). One major criticism is, I think, quite > > fundamental: shouln't large 'service values' in two cities imply a lower > > connectivity between these two cities as they through their larger 'service > > values' can offer more services to the respective city? In the specification > > above (and some other bulletins from GaWC) it doesn't; on the contrary. Two > > cities, one with a low service value and one with a high service value of > > TNC:s, should theoretically imply that there was more connections between > > these two actors/cities. > > > > But it is still extremely interesting, I think, to mix economic geography > > and (social) network analysis. In GaWC research bulletin 23, they have drawn > > an interesting sociogram (last page of this RB) where each city node consist > > of an internal setup of actors, i.e a subgraph interlocked in an actor. (Is > > there an official SNA terminology for such graphs; dumb newbie question no > > 324 perhaps...) > > > > Yours, > > Carl > > > > -----Ursprungligt meddelande----- > > Fran: Social Networks Discussion Forum [mailto:[log in to unmask]]For > > Valdis > > Skickat: den 18 oktober 2002 02:05 > > Till: [log in to unmask] > > Amne: city centrality > > > > ***** To join INSNA, visit http://www.sfu.ca/~insna/ ***** > > > > Wasn't there a recent conversation on how cities are linked? > > > > Sorry if this is a dup post, I just ran across this... > > > > http://www.lboro.ac.uk/gawc/rb/rb88.html > > > > Valdis > > > > _____________________________________________________________________ > > 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. > > _____________________________________________________________________ > 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. > _____________________________________________________________________ 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.