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
0.35	2
0.46	3
0.58	4
0.68	5
0.78	6
0.88	7
1.01	8
1.09	9
1.17	10
1.26	11
1.35	12
1.45	13
1.54	14
1.64	15
1.73	16
1.82	17
1.92	18
2.02	19
2.12	20
2.21	21
2.29	22
2.39	23
2.50	24
2.58	25
2.67	26
2.77	27
2.86	28
3.00	29
3.07	30
3.17	31
3.27	32
3.37	33
3.46	34
3.56	35
3.67	36
3.77	37
3.86	38
4.01	39
4.07	40
4.17	41
4.27	42
4.38	43
4.50	44
4.58	45
4.70	46
4.81	47
4.93	48
5.05	49
5.17	50
5.29	51
5.42	52
5.55	53
5.65	54
5.78	55
5.90	56
6.03	57
6.17	58
6.29	59
6.42	60
6.56	61
6.69	62
6.83	63
7.01	64
7.11	65
7.26	66
7.41	67
7.57	68
7.72	69
7.89	70
8.07	71
8.25	72
8.43	73
8.61	74
8.82	75
9.03	76
9.22	77
9.43	78
9.67	79
9.88	80
10.14	81
10.38	82
10.63	83
10.89	84
11.20	85
11.52	86
11.86	87
12.23	88
12.62	89
13.03	90
13.45	91
14.00	92
14.52	93
15.15	94
15.81	95
16.72	96
17.78	97
19.21	98
21.48	99
30.00	100