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In this paper we propose a modified gravity model that takes into account that a population generally consists of heterogeneous groups, and we suggest a new statistical test for heterogeneity. We apply our new model to two real world data sets, and it turns out that this new model fits the data...
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commuting flows from a Norwegian region with a high number of ferry connections and/or tunnels and bridges. Based on a doubly …-constrained gravity-based model specification we focus on how commuting flows respond to varying toll charges and ferry prices. Estimation … results are used to predict how the generation and distribution of commuting flows is affected when ferry connections are …
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