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
0.25	1
0.38	2
0.51	3
0.63	4
0.75	5
0.86	6
1.01	7
1.09	8
1.20	9
1.29	10
1.40	11
1.51	12
1.61	13
1.72	14
1.81	15
1.91	16
2.02	17
2.12	18
2.21	19
2.31	20
2.41	21
2.51	22
2.61	23
2.71	24
2.80	25
2.90	26
3.02	27
3.11	28
3.21	29
3.31	30
3.42	31
3.52	32
3.62	33
3.72	34
3.82	35
3.93	36
4.03	37
4.14	38
4.25	39
4.35	40
4.46	41
4.57	42
4.68	43
4.80	44
4.90	45
5.02	46
5.13	47
5.26	48
5.38	49
5.51	50
5.61	51
5.74	52
5.86	53
6.02	54
6.13	55
6.26	56
6.40	57
6.52	58
6.67	59
6.80	60
6.93	61
7.09	62
7.22	63
7.38	64
7.53	65
7.68	66
7.83	67
8.02	68
8.18	69
8.35	70
8.52	71
8.71	72
8.91	73
9.09	74
9.28	75
9.51	76
9.70	77
9.92	78
10.15	79
10.38	80
10.64	81
10.89	82
11.17	83
11.45	84
11.79	85
12.13	86
12.49	87
12.84	88
13.22	89
13.67	90
14.13	91
14.64	92
15.17	93
15.84	94
16.60	95
17.55	96
18.56	97
20.01	98
22.36	99
30.00	100