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
0.19	1
0.32	2
0.45	3
0.58	4
0.68	5
0.79	6
0.89	7
0.97	8
1.06	9
1.13	10
1.21	11
1.29	12
1.36	13
1.44	14
1.51	15
1.57	16
1.64	17
1.70	18
1.77	19
1.83	20
1.89	21
1.95	22
2.02	23
2.07	24
2.13	25
2.18	26
2.25	27
2.31	28
2.36	29
2.42	30
2.49	31
2.55	32
2.61	33
2.67	34
2.73	35
2.79	36
2.84	37
2.90	38
2.97	39
3.03	40
3.10	41
3.16	42
3.22	43
3.28	44
3.35	45
3.42	46
3.49	47
3.56	48
3.63	49
3.70	50
3.76	51
3.83	52
3.91	53
3.98	54
4.05	55
4.13	56
4.20	57
4.27	58
4.35	59
4.43	60
4.50	61
4.58	62
4.66	63
4.75	64
4.83	65
4.92	66
5.01	67
5.09	68
5.18	69
5.29	70
5.39	71
5.49	72
5.58	73
5.69	74
5.80	75
5.92	76
6.04	77
6.15	78
6.27	79
6.43	80
6.56	81
6.72	82
6.91	83
7.06	84
7.26	85
7.46	86
7.63	87
7.85	88
8.09	89
8.33	90
8.59	91
8.88	92
9.24	93
9.63	94
10.17	95
10.76	96
11.60	97
12.49	98
14.36	99
26.51	100