“…This technique has been previously used in sports by Okhusa (1999Okhusa ( , 2001) and Frick, Pietzner and Prinz (2006) and is currently being adopted elsewhere in fields such as labour economics (Carrasco 1999;Tribó, 2005;Cueto and Mato, 2006;Collier, 2005;Haurin and Sridhar, 2003;Gonzalo, 2002), in international relations (Box Steffensmeier, Reiter and Zorn 2003;Barros, Passos and Alana, 2005), corporate finance (Holtz-Eakin et al 1994, Orbe, Ferreira andNúñez Antón, 2002;Leung, Rigby and Young, 2003) and industry (Requena-Silvente and Walker, 2005).…”