Table 2. Weight calculated with the variation coefficient method.

Process	Staff training rate	Post variation rate	Safety management ability	Safety input
Expectation	0.16	0.0086	89	13.875
Standard deviation	0.0158	0.0054	6.4031	5.128
Variation coefficient	0.0988	0.6279	0.0719	0.3696
Weight	0.0846	0.5375	0.0615	0.3164