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
0.24	1
0.39	2
0.53	3
0.68	4
0.80	5
0.93	6
1.04	7
1.14	8
1.23	9
1.34	10
1.44	11
1.52	12
1.62	13
1.71	14
1.82	15
1.91	16
2.02	17
2.11	18
2.20	19
2.30	20
2.38	21
2.46	22
2.56	23
2.65	24
2.74	25
2.83	26
2.91	27
3.01	28
3.09	29
3.17	30
3.26	31
3.34	32
3.42	33
3.51	34
3.58	35
3.67	36
3.75	37
3.84	38
3.92	39
4.02	40
4.11	41
4.20	42
4.29	43
4.39	44
4.48	45
4.58	46
4.68	47
4.79	48
4.88	49
4.96	50
5.07	51
5.18	52
5.29	53
5.39	54
5.51	55
5.61	56
5.72	57
5.84	58
5.95	59
6.06	60
6.17	61
6.29	62
6.40	63
6.52	64
6.64	65
6.78	66
6.91	67
7.02	68
7.15	69
7.26	70
7.40	71
7.56	72
7.71	73
7.87	74
8.02	75
8.18	76
8.32	77
8.51	78
8.68	79
8.88	80
9.06	81
9.27	82
9.46	83
9.68	84
9.86	85
10.11	86
10.39	87
10.70	88
11.02	89
11.41	90
11.83	91
12.25	92
12.70	93
13.25	94
13.91	95
14.67	96
15.63	97
16.82	98
18.92	99
27.31	100