This paper extends the two-way flowmodel of network formation initiated by Bala and Goyal (Econometrica 68(5):1181–1230, 2000) by allowing for partner heterogeneity. In our model if a player i forms a link with player j , then she pays a cost of c j and gets benefits of Vj . Our main result consists of the characterization of strict Nash networks. We find that the introduction of partner hetero...

In this paper we propose that the conventional dichotomy between exemplar-based and prototype-based models of concept learning is helpfully viewed as an instance of what is known in the statistical learning literature as the bias/variance tradeoff. The bias/variance tradeoff can be thought of as a sliding scale that modulates how closely any learning procedure adheres to its training data. At o...

This appendix provides proofs and the entire set of data used in Corbae and Duffy [1]. In particular we show that for the environment laid out in our Corbae and Duffy [1], a marriage network is not only the ex-ante efficient network, but also stable in the sense of being immune to unilateral deviations.

First we develop the theory of reduced instability in order to analyze stability of bifurcating solutions via the Liapunov{Schmidt reduction. Next, this theory is generalized to cover sideband instabilities using a Floquet ansatz. The method is applied to roll patterns in the Swift{Hohenberg equation which serves as a model for pattern formation. We analyze the stability problem of small rolls ...

Vision should provide an explanation of the scene in terms of a causal semantics|what aaects what, and why. An important part of the causal explanation of static scenes is what supports what, or, counterfactu-ally: Why aren't things moving? We use simple naive physical knowledge as the basis of a vertically integrated vision system that explains arbitrarily complex stacked block structures. The...

Number-knower levels are a series of stages of number concept development in early childhood. A child's number-knower level is typically assessed using the give-N task. Although the task procedure has been highly refined, the standard ways of analyzing give-N data remain somewhat crude. Lee and Sarnecka (Cogn Sci 34:51-67, 2010, in press) have developed a Bayesian model of children's performanc...

In this paper we present a model of the multiple unit, single item procurement network formation problem in environments with incomplete information (MPNFI). For this we first develop the structure of the procurement network formation problem within Myerson’s framework for cooperative games with incomplete information [1]. Using this framework we then investigate the non-emptiness of the incent...

BACKGROUND A cryptosporidiosis epidemic occurred among residents and visitors to Collingwood, Ontario, during March 1996. Fifty-five per cent of 36 confirmed cases were Collingwood visitors and 57% of Collingwood resident cases were under 10 years of age. The low level of reported diarrhoeal illness among adult Collingwood residents caused government officials and physicians to question whether...

We study the control of modulational instability and pattern formation in a nonlinear dissipative feedback system with a periodic modulation of the material refractive index. We use a one-dimensional photonic lattice in a single-mirror feedback configuration and identify three mechanisms for pattern control: bandgap suppression of instability modes, periodicity induced pattern modes, and orient...