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1.
This paper proposes a functional connectivity approach, inspired by brain imaging literature, to model cross-sectional dependence.
Using a varying parameter framework, the model allows correlation patterns to arise from complex economic or social relations
rather than being simply functions of economic or geographic distances between locations. It nests the conventional spatial
and factor model approaches as special cases. A Bayesian Markov Chain Monte Carlo method implements this approach. A small
scale Monte Carlo study is conducted to evaluate the performance of this approach in finite samples, which outperforms both
a spatial model and a factor model. We apply the functional connectivity approach to estimate a hedonic housing price model
for Paris using housing transactions over the period 1990–2003. It allows us to get more information about complex spatial
connections and appears more suitable to capture the cross-sectional dependence than the conventional methods. 相似文献
2.
Laurent Somme Laura Moquet Muriel Quinet Maryse Vanderplanck Denis Michez Georges Lognay Anne-Laure Jacquemart 《Urban Ecosystems》2016,19(3):1149-1161
Urbanization affects the availability and diversity of floral resources (pollen and/or nectar) for wild pollinating insects. For example, urban green areas are characterized by an abundance of ornamental plant species. Increasingly, trees are planted to improve the aesthetics of urban streets and parks. These urban trees might offer important floral resources to pollinating insects. To examine the suitability of urban trees as resources for pollinating insects, we investigated the chemical composition of pollen and nectar as well as the amount of nectar produced by the nine major insect-pollinated tree species planted in cities of Western Europe, namely Acer pseudoplatanus, Aesculus carnea, A. hippocastanum, Robinia pseudoacacia, Tilia cordata, T. x euchlora, T. x europaea, T. platyphyllos and T. tomentosa. The analyses revealed that globally the Tilia trees provide pollen with lower contents of polypeptides, amino acids and phytosterols compared with the other species. Urban tree flowers offer abundant nectar with relatively high sugar contents (0.16–1.28 mg/flower); sucrose was the predominant sugar in all nectars. The investigated tree species could therefore be considered in future city plantings. 相似文献
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Urban Ecosystems - Urbanization poses a threat to long-lived vertebrates, particularly from road mortalities that can threaten population persistence. We studied movements, behavior and... 相似文献
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Georges Hudon 《Revue canadienne de statistique》1983,11(2):125-129
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In this paper, we show that Arrow's and Wilson's theorems hold for permutation, symmetric permutation and symmetric domains. Permutation domains concern assignments: n indivisible private goods are distributed betweenn selfish individuals. Symmetric permutation domains concern matchings: two sets ofn selfish individuals being given, pairs with an individual from each set are to be made. Symmetric domains concern pairings: a set of 2n selfish individuals being given,n pairs of individuals are to be made.We thank two anonymous referees for helpful suggestions. 相似文献
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Ozone depletion potential (ODP) represents the cumulative ozone depletion induced by a particular halocarbon relative to a reference gas (usually trichlorofluoromethane, CFC-11). We focus on ODP estimation for methyl bromide. Previous attempts at its estimation have assumed that components of the ODP equation are lognormally distributed. By considering a wide range of modeling scenarios, we show that this restriction (which is based on computational convenience rather than experimental evidence) has obscured the true uncertainty in the ODP value. Moreover, when publishing point estimates for the ODP value, previous authors have given either mean or median values. We submit that a more appropriate choice for a point estimate is the mode since the distribution of ODP is skewed and since the mode is by definition, the most likely value. For each modeling scenario considered, modal values are given. In general, we find these ODP point estimates are considerably lower than those published elsewhere. 相似文献
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