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
0.19	1
0.35	2
0.49	3
0.60	4
0.71	5
0.82	6
0.91	7
1.01	8
1.08	9
1.16	10
1.24	11
1.33	12
1.41	13
1.48	14
1.56	15
1.62	16
1.69	17
1.76	18
1.83	19
1.90	20
1.96	21
2.04	22
2.10	23
2.17	24
2.23	25
2.30	26
2.37	27
2.44	28
2.49	29
2.56	30
2.63	31
2.70	32
2.78	33
2.85	34
2.92	35
2.98	36
3.05	37
3.12	38
3.18	39
3.26	40
3.34	41
3.40	42
3.48	43
3.55	44
3.62	45
3.70	46
3.76	47
3.83	48
3.91	49
3.98	50
4.05	51
4.13	52
4.21	53
4.29	54
4.36	55
4.43	56
4.52	57
4.60	58
4.69	59
4.78	60
4.85	61
4.94	62
5.04	63
5.13	64
5.21	65
5.32	66
5.41	67
5.52	68
5.62	69
5.73	70
5.82	71
5.93	72
6.05	73
6.16	74
6.29	75
6.42	76
6.56	77
6.71	78
6.84	79
7.00	80
7.16	81
7.32	82
7.49	83
7.67	84
7.86	85
8.07	86
8.28	87
8.49	88
8.71	89
8.96	90
9.23	91
9.58	92
9.95	93
10.39	94
10.86	95
11.40	96
12.27	97
13.40	98
15.10	99
25.59	100