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
0.34	2
0.47	3
0.62	4
0.74	5
0.84	6
0.93	7
1.02	8
1.11	9
1.20	10
1.28	11
1.35	12
1.43	13
1.50	14
1.58	15
1.66	16
1.72	17
1.80	18
1.87	19
1.94	20
2.01	21
2.08	22
2.15	23
2.21	24
2.28	25
2.36	26
2.42	27
2.49	28
2.57	29
2.64	30
2.71	31
2.78	32
2.84	33
2.91	34
2.98	35
3.05	36
3.12	37
3.20	38
3.27	39
3.35	40
3.41	41
3.49	42
3.57	43
3.63	44
3.71	45
3.78	46
3.85	47
3.94	48
4.01	49
4.08	50
4.16	51
4.22	52
4.30	53
4.37	54
4.45	55
4.52	56
4.60	57
4.68	58
4.77	59
4.86	60
4.95	61
5.04	62
5.13	63
5.24	64
5.33	65
5.41	66
5.52	67
5.60	68
5.71	69
5.82	70
5.94	71
6.06	72
6.18	73
6.32	74
6.45	75
6.58	76
6.72	77
6.87	78
7.00	79
7.14	80
7.31	81
7.48	82
7.65	83
7.83	84
8.01	85
8.18	86
8.41	87
8.65	88
8.90	89
9.16	90
9.45	91
9.77	92
10.17	93
10.62	94
11.09	95
11.63	96
12.36	97
13.57	98
15.39	99
25.84	100