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
0.12	1
0.32	2
0.43	3
0.59	4
0.70	5
0.81	6
0.91	7
0.98	8
1.06	9
1.11	10
1.20	11
1.25	12
1.31	13
1.38	14
1.43	15
1.48	16
1.53	17
1.58	18
1.63	19
1.69	20
1.73	21
1.78	22
1.84	23
1.90	24
1.96	25
2.02	26
2.05	27
2.11	28
2.17	29
2.23	30
2.27	31
2.32	32
2.36	33
2.41	34
2.46	35
2.50	36
2.53	37
2.58	38
2.65	39
2.73	40
2.77	41
2.82	42
2.86	43
2.90	44
2.95	45
3.02	46
3.08	47
3.14	48
3.18	49
3.24	50
3.29	51
3.35	52
3.40	53
3.46	54
3.51	55
3.57	56
3.61	57
3.66	58
3.71	59
3.77	60
3.83	61
3.92	62
3.97	63
4.03	64
4.09	65
4.18	66
4.23	67
4.32	68
4.39	69
4.47	70
4.54	71
4.60	72
4.67	73
4.73	74
4.83	75
4.90	76
5.01	77
5.11	78
5.18	79
5.33	80
5.44	81
5.56	82
5.71	83
5.83	84
5.96	85
6.07	86
6.22	87
6.36	88
6.53	89
6.67	90
6.89	91
7.12	92
7.36	93
7.71	94
8.01	95
8.42	96
9.05	97
9.76	98
11.58	99
18.85	100