Out-of-control signals in three-part compositional T2 control chart

This work has been partially financed by the Agencia de Gestio d'Ajuts Universitaris i de Recerca (Ref: 2009SGR424) and by the Ministerio de Ciencia e Innovacion (Ref: MTM2012-33236 and Ref: MTM2009-13272). The authors wish to thank the Universitat de Girona for the grant given to Marina Vives-Mestres during her PhD studies (BR2011/66)