We provide practical advice for applied economists regarding robust specification and interpretation of linear regression models with interaction terms. We replicate a number of prominently published results using interaction effects and examine if they are robust to reasonable specification...

Using data from the US General Social Survey 1972–2004, we study the role of perceptions and status in self-reported happiness. Reference group income negatively relates to own happiness and high perceptions about own relative income, quality of dwelling, and social class relate positively and...

Global scenarios of energy provision with zero net emissions of greenhouse gases are considered. The scenarios assume the same demand for energy services and a high degree of emphasis on energy efficiency, with supply options clean fossil fuels, safe nuclear power, centralised or decentralised...

In contrast to conventional energy modeling made on a national basis, we consider energy use and supply per unit of land area. This is particularly suited for dealing with dispersed energy resources such as renewable energy, and by making the match of demand with supply on this basis in a...

The official Danish energy plan “Energy 21” calls for a very high penetration of wind energy in the electricity sector. This will put issues of fitting a variable energy source into a stable supply system in focus. The present study investigates the role that collaboration with the...