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
0.33	1
0.48	2
0.58	3
0.69	4
0.78	5
0.84	6
0.91	7
0.98	8
1.05	9
1.13	10
1.19	11
1.24	12
1.31	13
1.37	14
1.42	15
1.46	16
1.52	17
1.56	18
1.62	19
1.67	20
1.73	21
1.79	22
1.85	23
1.89	24
1.94	25
2.01	26
2.06	27
2.11	28
2.17	29
2.23	30
2.29	31
2.33	32
2.38	33
2.43	34
2.49	35
2.55	36
2.63	37
2.70	38
2.76	39
2.82	40
2.90	41
2.96	42
3.01	43
3.07	44
3.12	45
3.18	46
3.24	47
3.29	48
3.35	49
3.43	50
3.50	51
3.57	52
3.63	53
3.71	54
3.77	55
3.85	56
3.93	57
4.02	58
4.11	59
4.20	60
4.29	61
4.41	62
4.50	63
4.59	64
4.66	65
4.76	66
4.86	67
5.00	68
5.10	69
5.22	70
5.33	71
5.46	72
5.64	73
5.78	74
5.93	75
6.09	76
6.27	77
6.48	78
6.70	79
6.87	80
7.14	81
7.36	82
7.57	83
7.88	84
8.26	85
8.67	86
9.00	87
9.43	88
10.06	89
10.66	90
11.32	91
12.28	92
13.16	93
14.34	94
16.15	95
18.58	96
21.51	97
26.61	98
40.20	99
234.00	100