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
0.45	2
0.57	3
0.67	4
0.76	5
0.84	6
0.93	7
1.02	8
1.11	9
1.18	10
1.26	11
1.33	12
1.40	13
1.48	14
1.56	15
1.63	16
1.70	17
1.77	18
1.84	19
1.92	20
2.00	21
2.09	22
2.17	23
2.25	24
2.33	25
2.42	26
2.50	27
2.58	28
2.67	29
2.76	30
2.84	31
2.92	32
3.00	33
3.09	34
3.18	35
3.27	36
3.38	37
3.49	38
3.58	39
3.69	40
3.78	41
3.88	42
4.00	43
4.10	44
4.21	45
4.33	46
4.43	47
4.56	48
4.68	49
4.80	50
4.94	51
5.06	52
5.20	53
5.34	54
5.50	55
5.63	56
5.77	57
5.93	58
6.08	59
6.24	60
6.42	61
6.60	62
6.80	63
7.00	64
7.19	65
7.44	66
7.67	67
7.94	68
8.19	69
8.43	70
8.72	71
9.00	72
9.36	73
9.64	74
10.00	75
10.35	76
10.78	77
11.24	78
11.67	79
12.13	80
12.75	81
13.31	82
13.92	83
14.55	84
15.17	85
16.00	86
16.81	87
17.74	88
18.80	89
19.99	90
21.01	91
22.77	92
24.67	93
26.94	94
29.17	95
32.75	96
36.70	97
44.20	98
56.16	99
152.37	100