Geography Reference
In-Depth Information
t 5 ( p
^ nc ) / "
[ p
^ c ( 1 2 p
^ c ) 1 p
^ nc ( 1 2 p
^ nc )] / n , where p
^ nc have the same meaning as above, and n
is the size of both the citing and the cited samples ( n = n c = n nc ).
^ c 2 p
^ c and p
17.
More precisely, we exclude all the citing patents that turn out to be personally connected, and the related
controls; we also exclude all the control patents that turn out to be personally connected, and the citing
patents they were meant to match.
18.
In particular, we looked at the inventors of the originating patents and tracked backward their patent
history. For each originating patent, we identii ed the i rst previous patent i led (or the set of previous
patents i led in case of multiple patents in the same year), if any. We next compared the inventor's loca-
tion (MSA) at the time of the originating patent and that of the i rst previous patent i led. If these loca-
tions dif ered, then we considered the inventor as a mover. In case of multiple previous patents, we relaxed
this criterion and considered an inventor as a mover if at least one of the previous locations dif ered from
the one at the time of the originating patent.
References
Agrawal, A., I. Cockburn and J. McHale (2006), 'Gone but not forgotten: knowledge l ows, labour mobility,
and enduring social relationships', Journal of Economic Geography , 6 (5), 571-91.
Almeida, P. and B. Kogut (1999), 'Localisation of knowledge and the mobility of engineers in regional net-
works', Management Science , 45 (7), 905-17.
Boschma, R.A. and K. Frenken (2006), 'Why is economic geography not an evolutionary science? Towards an
evolutionary economic geography', Journal of Economic Geography , 6 (3), 273-302.
Breschi, S. and F. Lissoni (2001), 'Knowledge spillovers and local innovation systems: a critical survey',
Industrial and Corporate Change , 10 (4), 975-1005.
Breschi, S. and F. Lissoni (2004), 'Knowledge networks from patent data: methodological issues and
research targets', in W. Glänzel, H. Moed and U. Schmoch (eds), Handbook of Quantitative S&T Research ,
Dordrecht: Kluwer Academic Publishers.
Breschi, S. and F. Lissoni (2009), 'Mobility of skilled workers and co-invention networks: an anatomy of local-
ised knowledge l ows', Journal of Economic Geography , 9 (4), 439-68.
Breschi, S., F. Lissoni and F. Malerba (2003), 'Knowledge relatedness in i rm technological diversii cation',
Research Policy , 32 (1), 69-87.
Feldman, M.P. (1999), 'The new economics of innovation, spillovers and agglomeration: a review of empirical
studies', Economics of Innovation and New Technology , 8 , 5-25.
Griliches Z. (1992), 'The search for R&D spillovers', Scandinavian Journal of Economics , 94 , Supplement,
29-47.
Hall, B. (2004), 'Exploring the patent explosion', Journal of Technology Transfer , 30 , 35-48.
Jaf e, A.B., M. Trajtenberg and R. Henderson (1993), 'Geographic localisation of knowledge spillovers as
evidenced by patent citations', Quarterly Journal of Economics , 10 , 577-98.
Lissoni, F., B. Sanditov and G. Tarasconi (2006), 'The Keins database on academic inventors: methodology
and contents', CESPRI Working Paper No. 181.
Mowery, D.C. and A.A. Ziedonis (2001), 'The geographic reach of market and non-market channels of tech-
nology transfer: comparing citations and licenses of university patents', NBER Working Papers No. 8568.
Newman, M.E.J. (2001), 'The structure of scientii c collaboration networks', Proceedings of the National
Academy of Science USA , 98 , 404-9.
Singh, J.H. (2005), 'Collaborative networks as determinants of knowledge dif usion patterns', Management
Science , 51 (5), 756-70.
Wasserman, S. and C. Faust (1994), Social Network Analysis: Methods and Applications , Cambridge:
Cambridge University Press.
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