collective behavior is regarded as one of the main issues in contemporary political sociology, a social phenomenon that has long challenged political systems. the purpose of this paper is to study the factors affecting the tendency of the students of shiraz toward collective behavior. to explain collective behavior, we have used neil smelser’s theoretical framework and from the structural-funct...

In this paper, we study the selection of grouped variables using the random forests algorithm. We first propose a new importance measure adapted for groups of variables. Theoretical insights of this criterion are given for additive regression models. The second contribution of this paper is an original method for selecting functional variables based on the grouped variable importance measure. U...

Situations of a functional predictor paired with a scalar response are increasingly encountered in data analysis. Predictors are often appropriately modeled as square integrable smooth random functions. Imposing minimal assumptions on the nature of the functional relationship, we aim at estimating the directional derivatives and gradients of the response with respect to the predictor functions....