4.1.3. Underlying dimensions of tsunami safety measures
Principal Component Factor Analysis was used to determine the
underlying dimensions of the tsunami safety measure attributes of
the first data set. The Bartlett test of Sphericity and the
KaisereMeyereOlkin Measure of Sampling Adequacy indicated the
appropriateness of using an exploratory factor analysis of tsunami
safety measure attributes. The Bartlett test of Sphericity is significant
(p-value ¼ .000), indicating that a nonzero correlation exists
among all the items taken together. The Measure of Sampling
Adequacy of .80 exceeds the necessary threshold of sampling
adequacy, which requires a minimum of .50 (Hair, Anderson,
Tatham, & Black, 1998). This indicates that the set of tsunami
safety attributes used in the study meets the fundamental
requirements for an exploratory factor analysis (Hair et al., 1998).