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
0.37	2
0.50	3
0.60	4
0.71	5
0.81	6
0.91	7
1.03	8
1.14	9
1.25	10
1.34	11
1.44	12
1.55	13
1.64	14
1.75	15
1.84	16
2.00	17
2.03	18
2.14	19
2.23	20
2.33	21
2.42	22
2.52	23
2.62	24
2.72	25
2.81	26
2.92	27
3.03	28
3.13	29
3.23	30
3.34	31
3.43	32
3.54	33
3.64	34
3.74	35
3.84	36
4.00	37
4.04	38
4.16	39
4.26	40
4.37	41
4.50	42
4.60	43
4.70	44
4.81	45
4.93	46
5.04	47
5.17	48
5.28	49
5.40	50
5.52	51
5.64	52
5.78	53
5.90	54
6.03	55
6.16	56
6.30	57
6.44	58
6.58	59
6.72	60
6.86	61
7.02	62
7.15	63
7.30	64
7.45	65
7.62	66
7.78	67
7.94	68
8.11	69
8.27	70
8.45	71
8.63	72
8.82	73
9.02	74
9.20	75
9.40	76
9.62	77
9.84	78
10.06	79
10.32	80
10.56	81
10.82	82
11.10	83
11.38	84
11.68	85
12.03	86
12.37	87
12.76	88
13.15	89
13.58	90
14.03	91
14.53	92
15.09	93
15.75	94
16.52	95
17.36	96
18.41	97
19.84	98
22.06	99
30.00	100