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
0.30	1
0.46	2
0.58	3
0.68	4
0.79	5
0.88	6
0.96	7
1.04	8
1.11	9
1.20	10
1.27	11
1.35	12
1.42	13
1.50	14
1.58	15
1.65	16
1.72	17
1.79	18
1.86	19
1.93	20
2.00	21
2.09	22
2.17	23
2.25	24
2.32	25
2.40	26
2.47	27
2.54	28
2.62	29
2.70	30
2.78	31
2.86	32
2.94	33
3.00	34
3.13	35
3.21	36
3.31	37
3.40	38
3.50	39
3.59	40
3.69	41
3.79	42
3.90	43
4.00	44
4.12	45
4.24	46
4.35	47
4.49	48
4.60	49
4.73	50
4.86	51
5.00	52
5.10	53
5.23	54
5.36	55
5.50	56
5.67	57
5.84	58
6.00	59
6.17	60
6.34	61
6.54	62
6.74	63
6.97	64
7.18	65
7.39	66
7.60	67
7.84	68
8.07	69
8.34	70
8.60	71
8.89	72
9.25	73
9.53	74
9.85	75
10.20	76
10.60	77
11.00	78
11.44	79
11.99	80
12.50	81
13.01	82
13.58	83
14.24	84
15.00	85
15.65	86
16.48	87
17.42	88
18.33	89
19.55	90
20.97	91
22.48	92
24.47	93
26.28	94
28.75	95
32.33	96
36.15	97
43.01	98
55.14	99
162.00	100