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
0.06	1
0.10	2
0.13	3
0.16	4
0.20	5
0.23	6
0.27	7
0.31	8
0.35	9
0.39	10
0.42	11
0.45	12
0.49	13
0.53	14
0.56	15
0.60	16
0.65	17
0.69	18
0.74	19
0.78	20
0.83	21
0.87	22
0.93	23
0.98	24
1.03	25
1.08	26
1.14	27
1.18	28
1.25	29
1.30	30
1.35	31
1.41	32
1.47	33
1.54	34
1.61	35
1.67	36
1.73	37
1.80	38
1.88	39
1.96	40
2.04	41
2.13	42
2.21	43
2.30	44
2.38	45
2.48	46
2.58	47
2.71	48
2.83	49
2.94	50
3.05	51
3.17	52
3.32	53
3.43	54
3.58	55
3.75	56
3.91	57
4.09	58
4.24	59
4.39	60
4.58	61
4.78	62
5.00	63
5.25	64
5.53	65
5.75	66
6.00	67
6.22	68
6.51	69
6.75	70
7.03	71
7.39	72
7.73	73
8.16	74
8.50	75
8.94	76
9.33	77
9.75	78
10.17	79
10.67	80
11.20	81
11.73	82
12.52	83
13.33	84
14.01	85
15.01	86
15.72	87
16.72	88
18.00	89
19.66	90
21.00	91
23.08	92
25.53	93
28.06	94
31.49	95
36.07	96
41.50	97
49.05	98
60.44	99
144.00	100