This study investigates the factors that impact the duration of trade relationships in U.S. fresh fruit and vegetable imports. We employ both the survival analysis (KM estimates and Cox PH model) as well as a count data model. The preliminary results indicate that SPS treatment requirements...

The purpose of this study is to evaluate potential changes in the length of product life cycles in the US seed corn industry. We use the observed survival time on the market for hybrids sold during 1997-2009 to conduct a survival analysis. Our empirical results show that the expected lifetimes...

The polar projection presented here results from the need to have a uniform yet fairly simple method for recording the various phenomena and relations pertaining to land development. The contact infrastructure anisotropy and variable population and development density lead to socioeconomic space...

The user-written command georoute is designed to calculate travel distance and travel time between two addresses or two geographical points identified by their coordinates. Since its conception and description by Weber and Péclat (2017), the command has been gradually maintained and enriched....