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
0.22	1
0.35	2
0.48	3
0.59	4
0.70	5
0.80	6
0.91	7
1.02	8
1.10	9
1.19	10
1.29	11
1.39	12
1.48	13
1.56	14
1.64	15
1.72	16
1.79	17
1.87	18
1.95	19
2.04	20
2.13	21
2.22	22
2.29	23
2.38	24
2.46	25
2.54	26
2.62	27
2.70	28
2.78	29
2.86	30
2.95	31
3.03	32
3.11	33
3.18	34
3.27	35
3.36	36
3.44	37
3.52	38
3.60	39
3.69	40
3.77	41
3.85	42
3.92	43
4.02	44
4.10	45
4.19	46
4.29	47
4.38	48
4.47	49
4.55	50
4.64	51
4.74	52
4.83	53
4.93	54
5.03	55
5.12	56
5.22	57
5.32	58
5.44	59
5.54	60
5.65	61
5.75	62
5.86	63
6.00	64
6.11	65
6.22	66
6.35	67
6.47	68
6.60	69
6.73	70
6.86	71
7.01	72
7.14	73
7.28	74
7.42	75
7.56	76
7.75	77
7.91	78
8.09	79
8.29	80
8.48	81
8.68	82
8.89	83
9.11	84
9.32	85
9.57	86
9.84	87
10.09	88
10.38	89
10.69	90
11.08	91
11.47	92
11.89	93
12.37	94
13.00	95
13.70	96
14.77	97
15.91	98
17.92	99
28.38	100