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
0.50	3
0.63	4
0.76	5
0.88	6
1.01	7
1.09	8
1.19	9
1.29	10
1.39	11
1.48	12
1.57	13
1.65	14
1.75	15
1.85	16
1.93	17
2.02	18
2.11	19
2.20	20
2.28	21
2.37	22
2.46	23
2.54	24
2.64	25
2.73	26
2.82	27
2.90	28
3.00	29
3.08	30
3.17	31
3.26	32
3.35	33
3.44	34
3.52	35
3.61	36
3.69	37
3.78	38
3.88	39
3.96	40
4.06	41
4.14	42
4.22	43
4.32	44
4.41	45
4.50	46
4.60	47
4.70	48
4.80	49
4.90	50
5.01	51
5.11	52
5.21	53
5.33	54
5.43	55
5.53	56
5.63	57
5.74	58
5.86	59
6.00	60
6.10	61
6.24	62
6.35	63
6.48	64
6.62	65
6.76	66
6.89	67
7.02	68
7.14	69
7.27	70
7.41	71
7.55	72
7.70	73
7.85	74
8.01	75
8.15	76
8.32	77
8.52	78
8.68	79
8.86	80
9.05	81
9.27	82
9.46	83
9.68	84
9.91	85
10.17	86
10.43	87
10.72	88
11.04	89
11.40	90
11.77	91
12.20	92
12.67	93
13.14	94
13.75	95
14.59	96
15.50	97
16.75	98
18.71	99
28.84	100