Safety Measurement System

Measure vs. Percentile

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. Expand for more information.

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure only considers individual performance based on 24 months of data, with a measure of 0 indicating best performance. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. The graph below shows how the carrier’s measure correlates with its percentile rank over a selected period of time.

Measure

Percentile

Measure	Percentile
0	0
0.07	1
0.08	2
0.10	3
0.11	4
0.14	5
0.16	6
0.17	7
0.19	8
0.21	9
0.24	10
0.26	11
0.27	12
0.29	13
0.31	14
0.33	15
0.35	16
0.37	17
0.39	18
0.41	19
0.43	20
0.45	21
0.47	22
0.50	23
0.52	24
0.54	25
0.56	26
0.59	27
0.62	28
0.64	29
0.67	30
0.70	31
0.72	32
0.75	33
0.77	34
0.79	35
0.81	36
0.83	37
0.85	38
0.88	39
0.92	40
0.94	41
0.99	42
1.02	43
1.07	44
1.13	45
1.18	46
1.21	47
1.26	48
1.31	49
1.37	50
1.43	51
1.47	52
1.50	53
1.54	54
1.58	55
1.62	56
1.67	57
1.73	58
1.82	59
1.90	60
1.98	61
2.03	62
2.13	63
2.21	64
2.32	65
2.40	66
2.48	67
2.57	68
2.67	69
2.81	70
2.93	71
3.03	72
3.15	73
3.28	74
3.43	75
3.69	76
3.85	77
4.07	78
4.22	79
4.34	80
4.65	81
4.81	82
5.06	83
5.40	84
5.80	85
6.29	86
6.82	87
7.36	88
8.41	89
9.02	90
9.87	91
11.27	92
13.03	93
15.08	94
18.21	95
22.32	96
27.24	97
39.84	98
61.86	99
219.55	100