“…In the hotels sector, using DEA methodology, Tsaur (2001) in Taiwan, Barros and Mascarenhas (2005) and Barros and Santos (2006) in Portugal, Hu et al (2010) in Taiwan, Sigala et al (2005) in the UK, Assaf and Cvelbar (2010) in Slovenia and Yen and Othman (2011) in Malaysia have all studied the levels of TE, AE and CE in their target countries. Further Chen et al (2010) in Taiwan, Pavlyuk (2010) in the Baltic countries and Assaf and Barros (2011) in Angola have investigated the efficiency issue using the SFA methodology. Finally, researchers such as Pulina et al (2010) in Italy, Barros et al (2009) in Portugal and Pérez-Rodríguez and Acosta-González (2007) in Spain have all studied CE , Observation Efficient frontier X1/Output X2/Output using both SFA and DEA.…”