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
0.22	1
0.36	2
0.50	3
0.61	4
0.73	5
0.85	6
0.96	7
1.06	8
1.16	9
1.25	10
1.35	11
1.44	12
1.53	13
1.63	14
1.72	15
1.80	16
1.89	17
1.97	18
2.06	19
2.15	20
2.24	21
2.34	22
2.41	23
2.51	24
2.58	25
2.67	26
2.75	27
2.85	28
2.93	29
3.01	30
3.09	31
3.17	32
3.26	33
3.35	34
3.43	35
3.53	36
3.61	37
3.69	38
3.78	39
3.88	40
3.97	41
4.05	42
4.15	43
4.24	44
4.33	45
4.43	46
4.52	47
4.61	48
4.71	49
4.80	50
4.89	51
4.98	52
5.07	53
5.17	54
5.28	55
5.38	56
5.50	57
5.60	58
5.71	59
5.84	60
5.95	61
6.07	62
6.20	63
6.33	64
6.45	65
6.56	66
6.68	67
6.83	68
6.96	69
7.10	70
7.22	71
7.35	72
7.51	73
7.67	74
7.81	75
7.97	76
8.12	77
8.30	78
8.51	79
8.70	80
8.90	81
9.13	82
9.36	83
9.56	84
9.78	85
10.04	86
10.29	87
10.58	88
10.87	89
11.19	90
11.59	91
12.01	92
12.41	93
12.96	94
13.50	95
14.23	96
15.08	97
16.31	98
18.23	99
28.08	100