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
0.21	1
0.36	2
0.48	3
0.61	4
0.72	5
0.81	6
0.91	7
1.02	8
1.11	9
1.20	10
1.30	11
1.38	12
1.47	13
1.56	14
1.65	15
1.73	16
1.81	17
1.88	18
1.96	19
2.04	20
2.12	21
2.19	22
2.27	23
2.35	24
2.44	25
2.52	26
2.60	27
2.68	28
2.77	29
2.86	30
2.93	31
3.01	32
3.08	33
3.17	34
3.26	35
3.34	36
3.41	37
3.51	38
3.58	39
3.67	40
3.76	41
3.85	42
3.93	43
4.02	44
4.11	45
4.19	46
4.28	47
4.37	48
4.46	49
4.55	50
4.65	51
4.74	52
4.83	53
4.92	54
5.02	55
5.11	56
5.21	57
5.31	58
5.41	59
5.52	60
5.62	61
5.72	62
5.84	63
5.94	64
6.06	65
6.18	66
6.30	67
6.42	68
6.54	69
6.64	70
6.77	71
6.92	72
7.06	73
7.22	74
7.37	75
7.51	76
7.68	77
7.84	78
7.98	79
8.17	80
8.34	81
8.56	82
8.77	83
8.97	84
9.22	85
9.47	86
9.72	87
10.02	88
10.34	89
10.67	90
11.05	91
11.47	92
11.92	93
12.43	94
12.97	95
13.79	96
14.80	97
15.97	98
18.06	99
28.11	100