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
0.29	1
0.45	2
0.57	3
0.67	4
0.75	5
0.83	6
0.91	7
1.00	8
1.07	9
1.15	10
1.23	11
1.31	12
1.37	13
1.45	14
1.53	15
1.60	16
1.68	17
1.76	18
1.83	19
1.90	20
1.98	21
2.06	22
2.13	23
2.21	24
2.28	25
2.36	26
2.44	27
2.53	28
2.61	29
2.70	30
2.79	31
2.87	32
2.96	33
3.03	34
3.12	35
3.22	36
3.32	37
3.41	38
3.50	39
3.58	40
3.69	41
3.78	42
3.89	43
4.00	44
4.08	45
4.20	46
4.30	47
4.42	48
4.56	49
4.67	50
4.80	51
4.92	52
5.05	53
5.20	54
5.33	55
5.49	56
5.65	57
5.80	58
6.00	59
6.14	60
6.32	61
6.50	62
6.70	63
6.91	64
7.08	65
7.33	66
7.53	67
7.80	68
8.02	69
8.28	70
8.55	71
8.86	72
9.17	73
9.50	74
9.91	75
10.27	76
10.63	77
11.00	78
11.44	79
11.99	80
12.49	81
13.00	82
13.51	83
14.22	84
15.00	85
15.69	86
16.49	87
17.43	88
18.46	89
19.58	90
20.87	91
22.23	92
24.07	93
26.36	94
29.00	95
32.33	96
36.75	97
43.84	98
56.52	99
176.39	100