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
0.31	1
0.44	2
0.55	3
0.66	4
0.76	5
0.84	6
0.93	7
1.01	8
1.07	9
1.12	10
1.18	11
1.24	12
1.28	13
1.34	14
1.38	15
1.44	16
1.51	17
1.58	18
1.63	19
1.69	20
1.74	21
1.80	22
1.85	23
1.91	24
1.96	25
2.00	26
2.05	27
2.11	28
2.17	29
2.24	30
2.30	31
2.34	32
2.40	33
2.46	34
2.52	35
2.58	36
2.65	37
2.71	38
2.76	39
2.82	40
2.87	41
2.93	42
3.00	43
3.06	44
3.11	45
3.16	46
3.23	47
3.30	48
3.37	49
3.44	50
3.52	51
3.57	52
3.66	53
3.74	54
3.83	55
3.89	56
3.98	57
4.05	58
4.14	59
4.22	60
4.33	61
4.42	62
4.52	63
4.64	64
4.75	65
4.86	66
4.97	67
5.11	68
5.24	69
5.37	70
5.53	71
5.69	72
5.83	73
6.01	74
6.19	75
6.34	76
6.48	77
6.66	78
6.82	79
7.06	80
7.37	81
7.56	82
7.88	83
8.23	84
8.47	85
8.80	86
9.13	87
9.53	88
10.13	89
10.81	90
11.43	91
12.13	92
13.09	93
14.42	94
16.11	95
18.10	96
21.04	97
25.42	98
45.59	99
240.00	100