ors
in the governance of innovation. Their baseline to model innovation is the Poisson model,
but they also consider negative binomial models.
Berger et al. (2017) argue that nonlinearities in the innovation process emerge in case that the first
innovation is especially hard to obtain in comparison to succeeding innovations.
Then, hurdle models offer a useful way that allows for a distinction between these two processes.
Berger et al. (2017) show that an extended analysis with negative binomial hurdle model