Centre for Mathematics and Applications (CMA) and Department of Mathematics, FCT - NOVA University of Lisbon, Lisbon, Portugal.|Department of Statistics, Federal University of Bahia, Bahia, Brazil.|Center for Computational and Stochastic Mathematics (CEMAT) and Department of Mathematics, IST - University of Lisbon, Lisbon, Portugal.|Biostatistics Unit, Institute of Crop Science, University of Hohenheim, Stuttgart, Germany.