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
0.43	2
0.54	3
0.63	4
0.73	5
0.82	6
0.90	7
0.98	8
1.06	9
1.14	10
1.23	11
1.31	12
1.38	13
1.46	14
1.53	15
1.61	16
1.69	17
1.77	18
1.85	19
1.93	20
2.00	21
2.08	22
2.16	23
2.24	24
2.31	25
2.40	26
2.48	27
2.57	28
2.65	29
2.73	30
2.82	31
2.90	32
3.00	33
3.09	34
3.18	35
3.28	36
3.38	37
3.49	38
3.59	39
3.71	40
3.81	41
3.93	42
4.03	43
4.14	44
4.28	45
4.39	46
4.50	47
4.64	48
4.75	49
4.88	50
5.00	51
5.13	52
5.27	53
5.42	54
5.56	55
5.71	56
5.86	57
6.00	58
6.19	59
6.34	60
6.54	61
6.75	62
6.96	63
7.15	64
7.33	65
7.55	66
7.80	67
8.00	68
8.29	69
8.55	70
8.82	71
9.11	72
9.40	73
9.74	74
10.08	75
10.49	76
10.87	77
11.32	78
11.86	79
12.38	80
12.91	81
13.50	82
14.11	83
14.97	84
15.57	85
16.32	86
17.17	87
18.05	88
19.22	89
20.45	90
22.03	91
23.67	92
25.37	93
28.00	94
30.83	95
34.02	96
38.76	97
45.03	98
56.75	99
153.00	100