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
0.16	1
0.28	2
0.41	3
0.52	4
0.62	5
0.72	6
0.79	7
0.87	8
0.95	9
1.03	10
1.11	11
1.17	12
1.23	13
1.29	14
1.36	15
1.42	16
1.48	17
1.55	18
1.61	19
1.68	20
1.73	21
1.79	22
1.85	23
1.91	24
1.97	25
2.02	26
2.07	27
2.13	28
2.19	29
2.25	30
2.31	31
2.36	32
2.42	33
2.48	34
2.53	35
2.59	36
2.65	37
2.70	38
2.76	39
2.83	40
2.89	41
2.95	42
3.01	43
3.07	44
3.13	45
3.19	46
3.26	47
3.31	48
3.38	49
3.45	50
3.52	51
3.58	52
3.65	53
3.71	54
3.78	55
3.86	56
3.93	57
4.01	58
4.09	59
4.17	60
4.25	61
4.33	62
4.40	63
4.48	64
4.56	65
4.64	66
4.74	67
4.82	68
4.92	69
5.01	70
5.10	71
5.20	72
5.30	73
5.39	74
5.50	75
5.61	76
5.72	77
5.83	78
5.95	79
6.08	80
6.20	81
6.32	82
6.48	83
6.63	84
6.80	85
6.97	86
7.17	87
7.39	88
7.61	89
7.85	90
8.10	91
8.38	92
8.71	93
9.07	94
9.50	95
10.03	96
10.69	97
11.48	98
13.07	99
27.97	100