The Moroccan unemployment figures tell a tale of a statistical misery that hides another one's but more real and painful. First, the purpose of this essay is to highlight the fact that these figures are a product of preemptive arbitrations, in terms of definition and calculation methodology,...

The Moroccan unemployment figures tell a tale of a statistical misery that hides another one's but more real and painful. First, the purpose of this essay is to highlight the fact that these figures are a product of preemptive arbitrations, in terms of definition and calculation methodology,...

A recurrent problem in economic studies based on survey data is to determine whether survey weights should be used or not. We show that weighted estimators are more robust than unweighted ones, but less accurate when unweighted estimators are consistent. In some circumstances, a compatibility...

French Abstract: Le transport maritime est l'opération consistant à déplacer des marchandises d'un endroit à un autre par voie maritime. Ce mode de transport prend en compte le chargement des conteneurs dans les ports, la plupart des pays du continent africain n'ont qu'une connectivité...

A general formulation of Mixed Proportional Hazard models with K random effects is provided. It enables to account for a population stratified at K different levels. We then show how to approximate the partial maximum likelihood estimator using an EM algorithm. In a Monte Carlo study, the...