A real-options approach was used, incorporating uncertainty and irreversibility of investments, to study the number of stores entering the Swedish retail food market during the period 1994-2002. It was found that uncertainty affected the entry-decision. Entry was less frequent in highly...

We interpret the emergence of Jihadist terrorism in the light of contest theory. Al Qaeda may be portrayed as a contest organizer, providing a ‘prize’ to the best terrorist group. Each group maximizes its probability of winning by launching attacks more destructive than previous ones...

The negative binomial (NB) regression model is very popular in applied research when analyzing count data. The commonly used maximum likelihood (ML) estimator is very sensitive to highly intercorrelated explanatory variables. Therefore, a NB ridge regression estimator (NBRR) is proposed as a...

Measures of avoidable deaths incorporate the notion that deaths from certain causes should not occur within specified age groups given effective prevention or timely and appropriate access to health care. The present study investigated the impact on specific types of avoidable cancer deaths...

Prior research has concluded that socio-economic development does not significantly affect terrorism. We take an alternative view. First, we note that a country's socio-economic circumstances affect terrorists' behavior through terrorism's opportunity costs. We argue that this reasoning also...

Count data with excess zeros often occurs in areas such as public health, epidemiology, psychology, sociology, engineering, and agriculture. Zero-inflated Poisson (ZIP) regression and zero-inflated negative binomial (ZINB) regression are useful for modeling such data, but because of hierarchical...