Working Paper 12-07 Statistics and Econometrics Series 04 March 2012 Departamento de Estadística Universidad Carlos III de Madrid Calle Madrid, 126 28903 Getafe (Spain) Fax (34) 91 624-98-49 COMPARISONS AMONG SPACINGS FROM TWO POPULATIONS Nuria Torrado a and Rosa E. Lillo b Abstract In this work, we obtain some new results in the area of stochastic comparisons of simple and normalized spacings from two heterogeneous populations. We also show some applications of our results to multiple-outlier models. Keywords: stochastic comparisons, reliability, spacings a Universidad Pública de Navarra, Departamento de Estadística e Investigación Operativa, Campus de Arrosadía, Pamplona, Navarra, Spain. b Universidad Carlos III de Madrid, Departamento de Estadística, Facultad de Ciencias Sociales y Jurídicas, Campus de Getafe, Madrid, Spain. e-mail addresses: nuria.torrado@unavarra.es (Nuria Torrado) and rosaelvira.lillo@uc3m.es (Rosa E. Lillo).