http://hdl.handle.net/2072/1057 http://www.recercat.net/retrieve/2108 http://hdl.handle.net/2072/1057 Search the Channel s http://www.recercat.net/simple-search http://hdl.handle.net/2072/46739 title: An Introduction to parametric and non-parametric models for bivariate positive insurance claim severity distributions authors: Pitt, David; Guillén Estany, Montserrat <br>abstract: We present a real data set of claims amounts where costs related to damage are recorded separately from those related to medical expenses. Only claims with positive costs are considered here. Two approaches to density estimation are presented: a classical parametric and a semi-parametric method, based on transformation kernel density estimation. We explore the data set with standard univariate methods. We also propose ways to select the bandwidth and transformation parameters in the univariate case based on Bayesian methods. We indicate how to compare the results of alternative methods both looking at the shape of the overall density domain and exploring the density estimates in the right tail. <br> Fri, 26 Feb 2010 22:58:59 GMT http://hdl.handle.net/2072/46736 title: Which firms want PhDs? The effect of the university-industry relationship on the PhD labour market authors: García Quevedo, José, 1963-; Mas Verdú, Francisco; Polo Otero, José <br>abstract: PhD graduates hold the highest education degree, are trained to conduct research and can be considered a key element in the creation, commercialization and diffusion of innovations. The impact of PhDs on innovation and economic development takes place through several channels such as the accumulation of scientific capital stock, the enhancement of technology transfers and the promotion of cooperation relationships in innovation processes. Although the placement of PhDs in industry provides a very important mechanism for transmitting knowledge from universities to firms, information about the characteristics of the firms that employ PhDs is very scarce. The goal of this paper is to improve understanding of the determinants of the demand for PhDs in the private sector. Three main potential determinants of the demand for PhDs are considered: cooperation between firms and universities, R&D activities of firms and several characteristics of firms, size, sector, productivity and age. The results from the econometric analysis show that cooperation between firms and universities encourages firms to recruit PhDs and point to the existence of accumulative effects in the hiring of PhD graduates. <br> Fri, 26 Feb 2010 22:58:59 GMT http://hdl.handle.net/2072/43872 title: The Accessibility City. When Transport Infrastructure Matters in Urban Spatial Structure authors: García López, Miquel-Àngel <br>abstract: Suburbanization is changing the urban spatial structure and less monocentric metropolitan regions are becoming the new urban reality. Focused only on centers, most works have studied these spatial changes neglecting the role of transport infrastructure and its related location model, the “accessibility city”, in which employment and population concentrate in low-density settlements and close to transport infrastructure. For the case of Barcelona, we consider this location model and study the population spatial structure between 1991 and 2006. The results reveal a mix between polycentricity and the accessibility city, with movements away from the main centers, but close to the transport infrastructure. <br> Fri, 29 Jan 2010 22:58:59 GMT http://hdl.handle.net/2072/43806 title: Preliminary report of the first season work of the International Pluridisciplinary Archaeological Expedition to Bactria 2008 authors: Gurt, Josep M.; Pidaev, Shakir; Rauret, Anna M.; Stride, Sebastian <br>abstract: This year the development of our project can be divided into two main clearly different parts, on one hand the laboratory work, where the sampled ceramic individuals has been prepared and analyzed and the elaboration of the data obtained during the excavation of 2007 has been finished and, on the other hand, the field work developed at the archaeological site during this specific year (2008). In the mark of the analytical work a significant number of ceramic individuals (144) from the different stratigraphical units from various areas of the excavation of Termez and Tchinguiz Tepe sampled during the new and previous field works has been archaeometrically characterized. This specific material included individuals dated into the Hellenistic and Sassanian period, which has been confirmed by C14 dating upon organic samples. At the same time, in the mark of the field work of 2008 the archaeological record, already started to be under study during the excavation of 2007, has been completed and two new archaeological records have been registered on of which is located in the area of Tchinguiz Tepe. For the archeological study the information of the previous geophysical prospecting has been indisputably taken into consideration and the same methodology has been applied to crosscheck the latter archaeological results. <br> Wed, 10 Feb 2010 13:55:33 GMT