We apply Polynomial chaos expansion (PCE) to surrogate time-consuming repeated model evaluations for different parameter values. PCE represents a random variable, the quantity of interest (QoI), as a series expansion of other random variables, the inputs. Repeated evaluations become inexpensive...

Typically, the inefficiency term in stochastic frontier models is assumed to be positively skewed; however, efficiency scores are biased if this assumption is violated. This paper considers the case in which negative skewness is also allowed in the model. The paper discusses estimation of a...

In recent years, the issue of increasing economic inequality in both advanced and emerging economies has garnered considerable focus, sparking numerous debates in economic and political circles. At the heart of social science inquiries is the critical question of whether economic inequality acts...

Current time allocation models face three limitations: First, they only describe the average time allocation. Thus, information about the order of activities is lost, so influences of activities on later ones (i.e. interactions) are difficult to describe. Second, they assume a fixed effort...