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
0.35	1
0.47	2
0.55	3
0.60	4
0.66	5
0.71	6
0.82	7
0.91	8
0.99	9
1.05	10
1.11	11
1.15	12
1.21	13
1.25	14
1.29	15
1.32	16
1.36	17
1.41	18
1.46	19
1.54	20
1.57	21
1.62	22
1.65	23
1.68	24
1.71	25
1.74	26
1.76	27
1.80	28
1.84	29
1.88	30
1.92	31
1.96	32
2.01	33
2.05	34
2.09	35
2.13	36
2.18	37
2.22	38
2.25	39
2.31	40
2.34	41
2.37	42
2.42	43
2.47	44
2.50	45
2.55	46
2.61	47
2.64	48
2.69	49
2.73	50
2.77	51
2.80	52
2.85	53
2.90	54
2.93	55
2.98	56
3.03	57
3.09	58
3.15	59
3.20	60
3.25	61
3.32	62
3.36	63
3.45	64
3.52	65
3.59	66
3.63	67
3.68	68
3.79	69
3.85	70
3.95	71
4.02	72
4.13	73
4.22	74
4.32	75
4.43	76
4.53	77
4.60	78
4.72	79
4.86	80
5.01	81
5.16	82
5.32	83
5.50	84
5.70	85
5.89	86
6.09	87
6.39	88
6.65	89
6.94	90
7.49	91
7.97	92
8.49	93
9.06	94
10.31	95
11.55	96
14.02	97
16.29	98
35.71	99
666.00	100