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
0.23	1
0.35	2
0.46	3
0.57	4
0.67	5
0.77	6
0.86	7
1.00	8
1.06	9
1.15	10
1.25	11
1.34	12
1.43	13
1.52	14
1.62	15
1.72	16
1.81	17
1.90	18
2.02	19
2.09	20
2.19	21
2.28	22
2.38	23
2.47	24
2.56	25
2.67	26
2.76	27
2.86	28
2.94	29
3.03	30
3.14	31
3.25	32
3.34	33
3.45	34
3.55	35
3.67	36
3.76	37
3.85	38
4.00	39
4.04	40
4.17	41
4.26	42
4.37	43
4.46	44
4.58	45
4.68	46
4.80	47
4.90	48
5.03	49
5.14	50
5.26	51
5.38	52
5.51	53
5.62	54
5.73	55
5.85	56
6.01	57
6.11	58
6.25	59
6.38	60
6.52	61
6.67	62
6.79	63
6.92	64
7.07	65
7.22	66
7.39	67
7.55	68
7.70	69
7.86	70
8.04	71
8.21	72
8.39	73
8.58	74
8.78	75
9.01	76
9.18	77
9.40	78
9.61	79
9.84	80
10.07	81
10.31	82
10.57	83
10.84	84
11.15	85
11.48	86
11.83	87
12.19	88
12.60	89
13.02	90
13.42	91
13.92	92
14.51	93
15.11	94
15.84	95
16.60	96
17.71	97
19.26	98
21.52	99
30.00	100