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
0.09	2
0.10	3
0.12	4
0.14	5
0.17	6
0.18	7
0.21	8
0.22	9
0.23	10
0.26	11
0.26	12
0.28	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
0.49	23
0.50	24
0.51	25
0.54	26
0.58	27
0.61	28
0.63	29
0.65	30
0.68	31
0.70	32
0.73	33
0.76	34
0.78	35
0.80	36
0.82	37
0.84	38
0.89	39
0.92	40
0.95	41
0.99	42
1.02	43
1.07	44
1.09	45
1.16	46
1.22	47
1.25	48
1.30	49
1.34	50
1.40	51
1.45	52
1.48	53
1.55	54
1.61	55
1.66	56
1.73	57
1.80	58
1.85	59
1.91	60
1.97	61
2.04	62
2.16	63
2.22	64
2.29	65
2.38	66
2.45	67
2.56	68
2.63	69
2.72	70
2.84	71
2.96	72
3.10	73
3.23	74
3.34	75
3.53	76
3.69	77
3.88	78
4.11	79
4.37	80
4.54	81
4.81	82
5.02	83
5.29	84
5.75	85
6.13	86
6.72	87
7.42	88
8.17	89
8.89	90
10.13	91
11.45	92
13.36	93
16.09	94
19.28	95
22.69	96
30.32	97
44.94	98
73.19	99
241.00	100