2.3. Statistical Analysis

The data were analyzed using SPSS (International Business Machines Corporation IBM, Armonk, NY, USA). The Cronbach’s Alpha coefficient for the value scores was used to determine the reliability of the scales, which came back as higher than 0.7, thus confirming the reliability of the questionnaire. To check the questionnaire’s validity, a factor analysis of the valuations was performed, using the Kaiser-Meyer-Olkin measure, which was 0.75. The null hypothesis was rejected by the Bartlett sphericity test, thus the use of the factor analysis was deemed acceptable. The factor analysis yielded four factors that represent the four dimensions in Table 1, thus confirming the validity of the questionnaire. The importance-performance analysis is required in order to know the importance of each attribute that was obtained by applying the structural equations model, based on the criteria of Allen et al. [29].