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
0.30	1
0.46	2
0.57	3
0.67	4
0.76	5
0.84	6
0.92	7
1.01	8
1.10	9
1.17	10
1.25	11
1.32	12
1.39	13
1.47	14
1.55	15
1.62	16
1.70	17
1.77	18
1.84	19
1.92	20
2.00	21
2.08	22
2.16	23
2.24	24
2.32	25
2.40	26
2.49	27
2.57	28
2.65	29
2.74	30
2.83	31
2.91	32
3.00	33
3.07	34
3.15	35
3.25	36
3.34	37
3.45	38
3.55	39
3.65	40
3.74	41
3.85	42
3.94	43
4.05	44
4.17	45
4.29	46
4.39	47
4.50	48
4.63	49
4.78	50
4.90	51
5.00	52
5.15	53
5.29	54
5.43	55
5.60	56
5.74	57
5.90	58
6.02	59
6.23	60
6.40	61
6.58	62
6.76	63
6.97	64
7.20	65
7.44	66
7.67	67
7.92	68
8.18	69
8.41	70
8.67	71
9.00	72
9.27	73
9.60	74
10.00	75
10.33	76
10.71	77
11.16	78
11.65	79
12.06	80
12.63	81
13.23	82
13.80	83
14.56	84
15.27	85
16.00	86
16.81	87
17.75	88
18.75	89
19.96	90
21.10	91
22.71	92
24.72	93
27.00	94
29.36	95
33.03	96
37.78	97
44.95	98
57.10	99
150.00	100