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
0.35	1
0.52	2
0.58	3
0.67	4
0.73	5
0.78	6
0.85	7
0.93	8
0.97	9
1.01	10
1.06	11
1.13	12
1.18	13
1.22	14
1.26	15
1.33	16
1.37	17
1.43	18
1.46	19
1.51	20
1.56	21
1.59	22
1.63	23
1.67	24
1.70	25
1.77	26
1.81	27
1.84	28
1.88	29
1.91	30
1.95	31
1.98	32
2.02	33
2.04	34
2.07	35
2.12	36
2.16	37
2.20	38
2.22	39
2.29	40
2.35	41
2.40	42
2.45	43
2.50	44
2.54	45
2.57	46
2.62	47
2.67	48
2.71	49
2.76	50
2.80	51
2.83	52
2.86	53
2.90	54
2.95	55
2.99	56
3.03	57
3.08	58
3.14	59
3.18	60
3.23	61
3.27	62
3.32	63
3.37	64
3.42	65
3.52	66
3.59	67
3.65	68
3.71	69
3.78	70
3.86	71
3.95	72
4.07	73
4.18	74
4.26	75
4.33	76
4.42	77
4.48	78
4.62	79
4.72	80
4.84	81
4.99	82
5.11	83
5.35	84
5.56	85
5.79	86
5.90	87
6.07	88
6.30	89
6.62	90
7.07	91
7.42	92
7.87	93
8.37	94
9.03	95
10.30	96
11.97	97
14.79	98
21.31	99
724.81	100