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
0.21	1
0.35	2
0.47	3
0.59	4
0.70	5
0.80	6
0.89	7
1.00	8
1.07	9
1.16	10
1.25	11
1.35	12
1.45	13
1.53	14
1.62	15
1.69	16
1.77	17
1.85	18
1.94	19
2.03	20
2.11	21
2.19	22
2.27	23
2.35	24
2.43	25
2.51	26
2.59	27
2.67	28
2.74	29
2.82	30
2.90	31
3.00	32
3.06	33
3.15	34
3.22	35
3.30	36
3.38	37
3.47	38
3.53	39
3.62	40
3.70	41
3.78	42
3.87	43
3.95	44
4.04	45
4.13	46
4.21	47
4.30	48
4.40	49
4.48	50
4.57	51
4.67	52
4.75	53
4.85	54
4.95	55
5.04	56
5.14	57
5.24	58
5.34	59
5.43	60
5.54	61
5.63	62
5.74	63
5.86	64
5.97	65
6.10	66
6.22	67
6.34	68
6.45	69
6.58	70
6.72	71
6.86	72
7.01	73
7.14	74
7.28	75
7.42	76
7.58	77
7.74	78
7.93	79
8.09	80
8.27	81
8.48	82
8.68	83
8.87	84
9.10	85
9.32	86
9.58	87
9.86	88
10.15	89
10.41	90
10.79	91
11.21	92
11.67	93
12.22	94
12.85	95
13.60	96
14.55	97
15.65	98
17.69	99
28.00	100