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
0.19	1
0.35	2
0.49	3
0.60	4
0.71	5
0.80	6
0.91	7
1.01	8
1.09	9
1.17	10
1.26	11
1.33	12
1.40	13
1.47	14
1.54	15
1.61	16
1.69	17
1.76	18
1.82	19
1.89	20
1.96	21
2.03	22
2.10	23
2.17	24
2.22	25
2.28	26
2.35	27
2.42	28
2.48	29
2.55	30
2.62	31
2.70	32
2.77	33
2.84	34
2.90	35
2.98	36
3.06	37
3.12	38
3.18	39
3.25	40
3.32	41
3.39	42
3.46	43
3.52	44
3.60	45
3.67	46
3.74	47
3.82	48
3.89	49
3.96	50
4.05	51
4.12	52
4.19	53
4.27	54
4.35	55
4.43	56
4.51	57
4.58	58
4.67	59
4.75	60
4.84	61
4.92	62
5.01	63
5.11	64
5.19	65
5.29	66
5.40	67
5.50	68
5.61	69
5.70	70
5.81	71
5.92	72
6.02	73
6.14	74
6.26	75
6.38	76
6.53	77
6.67	78
6.81	79
6.98	80
7.12	81
7.31	82
7.47	83
7.65	84
7.83	85
8.01	86
8.22	87
8.45	88
8.71	89
8.96	90
9.25	91
9.57	92
9.94	93
10.35	94
10.81	95
11.41	96
12.23	97
13.42	98
15.09	99
25.60	100