Identifying Incident Causal Factors to Improve Aviation Transportation Safety: Proposing a Deep Learning Approach

Table 5

The distribution of the number of labels along with distribution of labels within each number.

Number of labels	Total (%)	HF (%)	AC (%)	CP (%)	PR (%)	WE (%)	AP (%)
One	65.3	42.7	17.4	0.9	2	0.8	1.3
Two	24.3	14.6	4.6	2.01	1.05	1.16	0.8
Three	8.7	4.88	1.38	0.73	0.47	1.01	0.25
Four	1.6	0.8	0.2	0.15	0.08	0.3	0.08
Overall	100	63.0	23.6	3.8	3.6	3.3	2.4

The data is interpreted in this way; take the highlighted number for instance; 14.6% of all incident reports are marked exactly two causal factors (labels), and one of them is HF. It shows that HF prevails in both single and multiple labels.