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
0.22	1
0.35	2
0.48	3
0.61	4
0.73	5
0.84	6
0.95	7
1.06	8
1.17	9
1.25	10
1.35	11
1.43	12
1.52	13
1.62	14
1.71	15
1.80	16
1.89	17
2.00	18
2.07	19
2.16	20
2.25	21
2.33	22
2.42	23
2.51	24
2.59	25
2.67	26
2.75	27
2.84	28
2.93	29
3.02	30
3.09	31
3.18	32
3.27	33
3.36	34
3.45	35
3.53	36
3.62	37
3.71	38
3.80	39
3.89	40
4.00	41
4.07	42
4.17	43
4.26	44
4.36	45
4.45	46
4.54	47
4.64	48
4.73	49
4.82	50
4.92	51
5.02	52
5.10	53
5.21	54
5.33	55
5.43	56
5.54	57
5.66	58
5.77	59
5.90	60
6.01	61
6.11	62
6.23	63
6.35	64
6.48	65
6.60	66
6.75	67
6.88	68
7.01	69
7.14	70
7.25	71
7.37	72
7.51	73
7.67	74
7.81	75
8.00	76
8.15	77
8.31	78
8.52	79
8.70	80
8.91	81
9.11	82
9.34	83
9.54	84
9.79	85
10.03	86
10.27	87
10.55	88
10.85	89
11.17	90
11.54	91
11.96	92
12.43	93
12.91	94
13.58	95
14.34	96
15.27	97
16.31	98
18.32	99
28.76	100