Table 8. Repeated reliability and validity analysis of gas data in Case Study 2.
| Descriptive Statistics | Communalities | Cronbach’s Alpha | Validity Analysis | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mean | Std. Deviation | Analysis N | Initial | Extraction | |||||
| T010104 | .0779 | .00606 | 9430 | 1.000 | .871 | .888 | Kaiser-Meyer-Olkin Measure of Sampling Adequacy | .893 | |
| T010105 | .0262 | .00635 | 9430 | 1.000 | .788 | ||||
| T010106 | .0384 | .00567 | 9430 | 1.000 | .853 | ||||
| T010203 | .1709 | .01419 | 9430 | 1.000 | .859 | ||||
| T010205 | .1526 | .00809 | 9430 | 1.000 | .865 | Bartlett’s Test of Sphericity | Approx. Chi-Square | 72885.396 | |
| T010303 | .1147 | .00716 | 9430 | 1.000 | .610 | ||||
| T010305 | .3839 | .01730 | 9430 | 1.000 | .829 | ||||
| T010306 | .2739 | .01210 | 9430 | 1.000 | .765 | df | 55 | ||
| T010307 | .3170 | .01568 | 9430 | 1.000 | .677 | Sig. | .000 | ||
| T010401 | .3824 | .01299 | 9430 | 1.000 | .624 | Average Communality | .766 | ||
| T010501 | .0307 | .00604 | 9430 | 1.000 | .683 | Anti-image Correlations | > 0.5 | ||
Another correlation analysis was then conducted to confirm the relationship between the remaining eleven items (T010104, T010105, T010106, T010203, T010205, T010303, T010305, T010306, T010307, 010401, T010501). Robust correlations (greater than 0.3) existed between every two items at the 0.01 level (S3 Appendix).