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
0.40	2
0.55	3
0.68	4
0.80	5
0.93	6
1.04	7
1.14	8
1.25	9
1.34	10
1.43	11
1.52	12
1.61	13
1.71	14
1.81	15
1.91	16
2.02	17
2.11	18
2.20	19
2.30	20
2.38	21
2.48	22
2.57	23
2.67	24
2.74	25
2.83	26
2.92	27
3.02	28
3.09	29
3.19	30
3.27	31
3.37	32
3.45	33
3.54	34
3.63	35
3.72	36
3.80	37
3.90	38
4.00	39
4.07	40
4.16	41
4.25	42
4.35	43
4.45	44
4.54	45
4.63	46
4.72	47
4.83	48
4.93	49
5.04	50
5.14	51
5.25	52
5.35	53
5.45	54
5.55	55
5.67	56
5.78	57
5.88	58
6.01	59
6.12	60
6.24	61
6.35	62
6.47	63
6.58	64
6.71	65
6.86	66
6.96	67
7.08	68
7.22	69
7.36	70
7.51	71
7.66	72
7.80	73
7.95	74
8.10	75
8.25	76
8.45	77
8.61	78
8.78	79
8.96	80
9.17	81
9.37	82
9.56	83
9.81	84
10.04	85
10.32	86
10.61	87
10.90	88
11.25	89
11.58	90
12.00	91
12.36	92
12.84	93
13.40	94
14.12	95
14.91	96
15.76	97
16.95	98
19.06	99
28.33	100