The common interpretation given to choice behavior that satisfies the traditional revealed preference axioms is that it results from the maximization of a single preference. We show that choice data alone does not enable one to rule out the possibility that the choice behavior that satisfies the revealed preference axioms is instead the result of the aggregation of a collection of distinct pref...

The strength of association between the row and column variables in a cross table varies with the level of aggregation of each variable. In many settings like the simultaneous discretization of two variables, it is useful to determine the aggregation level that maximizes the association. This paper deals with the behavior of association measures with respect to the aggregation of rows and colum...

We study the self-organized aggregation of a swarm of robots in a closed arena. We assume that the perceptual range of the robots are smaller than the size of the arena and the robots do not have information on the size of the swarm of the size of the arena. Using a probabilistic generic aggregation behavior model inspired from studies of social insects, we propose a macroscopic model for predi...

Comparison between two time points of the same categorical variable for the same study extent can reveal changes among categories over time, such as transitions among land categories. If many categories exist, then analysis can be difficult to interpret. Category aggregation is the procedure that combines two or more categories to create a single broader category. Aggregation can simplify inter...