"the observed statistics....can be derived". Indeed. Roger Critchlow wrote: > > > On 8/9/07, *Marcus G. Daniels* <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> wrote: > > Right, "generative social science", a.k.a. "made up stuff"... > > > Speaking of which, for those in the vicinity of Los Alamos: > > Thursday, August 9th,2007 > > 4:00 pm - 5:00 pm > > CNLS Conference Room (TA-3, Bldg 1690) > > Gang Recruitment and Growth: A Cellular Automata and Directed Graph > Approach to > the Statistics of Gang Sizes > > > William I. Newman > UCLA > > Cellular automata models can be developed to describe the evolution of > emergent > dynamical systems that maintain a discrete character, including those > with an > implicit hierarchical character. Moreover, these models can be related to > > directed graphs. These methods have found widespread application in > condensed > matter physics (e.g., diffusion limited aggregation and crystal growth, > sandpiles andself-organized criticality) as well as in earth and > environmental > > physics (e.g., models of earthquakes and river networks). In particular, > models > developed for forest fires are manifestly complex systems that show > well-preserved scaling laws relating to the frequency of forest fires > relative > > to their size. In sociological studies of conflict and deadly quarrels, > similar > statistical scaling laws have been observed, e.g., Richardson, with > identical > power-law indices. In earlier work, Gabrielov, Newman, and Turcotte (199?) > > succeeded in deriving from first principles those scaling laws. Here, we > show > that a simple redefinition of terms makes it possible for the statistics > of > gangs to be obtained from these other cellular automata models. In > particular, > > by equivalencing the recruitment of gang members in the sociological > problem > with the planting of trees in the environmental problem, the observed > statistics of gang populations and their prevalence can be derived. > > > LANL Host: Mac Hyman, T-7 > > > > ------------------------------------------------------------------------ > > ============================================================ > FRIAM Applied Complexity Group listserv > Meets Fridays 9a-11:30 at cafe at St. John's College > lectures, archives, unsubscribe, maps at http://www.friam.org
============================================================ FRIAM Applied Complexity Group listserv Meets Fridays 9a-11:30 at cafe at St. John's College lectures, archives, unsubscribe, maps at http://www.friam.org
