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
0.36	2
0.48	3
0.61	4
0.72	5
0.84	6
0.95	7
1.04	8
1.13	9
1.23	10
1.32	11
1.42	12
1.51	13
1.59	14
1.69	15
1.78	16
1.88	17
1.97	18
2.07	19
2.15	20
2.24	21
2.34	22
2.41	23
2.51	24
2.59	25
2.68	26
2.78	27
2.86	28
2.94	29
3.02	30
3.10	31
3.18	32
3.26	33
3.35	34
3.44	35
3.53	36
3.61	37
3.70	38
3.78	39
3.87	40
3.95	41
4.04	42
4.14	43
4.22	44
4.32	45
4.42	46
4.51	47
4.59	48
4.69	49
4.77	50
4.86	51
4.97	52
5.06	53
5.17	54
5.26	55
5.37	56
5.47	57
5.57	58
5.69	59
5.79	60
5.90	61
6.01	62
6.12	63
6.25	64
6.36	65
6.50	66
6.62	67
6.75	68
6.87	69
7.01	70
7.14	71
7.28	72
7.46	73
7.59	74
7.77	75
7.91	76
8.05	77
8.22	78
8.41	79
8.61	80
8.81	81
9.02	82
9.23	83
9.47	84
9.70	85
9.94	86
10.20	87
10.48	88
10.80	89
11.08	90
11.46	91
11.82	92
12.30	93
12.78	94
13.37	95
14.10	96
15.00	97
16.22	98
18.30	99
29.47	100