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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
>
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