Using a unique self-collected dataset that comprehends the population of research-based spin-offs created in Portugal from 1995 until to 2007, we investigate the location choices of these firms. In order to do so we control for both university- and region-related mechanisms. Our results suggest...

Purpose The Chinese Government has used a number of policies to encourage commercial agribusiness firms to do more innovation. These include public sector agricultural research and development (R&D), public sector biotechnology research and innovation, subsidies for commercial research,...

Hurdle models based on the zero-truncated Poisson-lognormal distribution are rarely used in applied work, although they incorporate some advantages compared with their negative binomial alternatives. I present a command that enables Stata users to estimate Poisson-lognormal hurdle models. I use...

We propose a new bivariate negative binomial model with constant correlation structure, which was derived from a contagious bivariate distribution of two independent Poisson mass functions, by mixing the proposed bivariate gamma type density with constantly correlated covariance structure...

In this paper we use data coming from the new Italian Survey on Health Ageing and Wealth (SHAW) to analyse physician services utilization in Italy explicitly acknowledging the existence of two different classes of providers: public and private. We consider visits by a specialist physician as the...