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
0.36	2
0.48	3
0.61	4
0.73	5
0.84	6
0.95	7
1.04	8
1.14	9
1.23	10
1.33	11
1.41	12
1.51	13
1.60	14
1.69	15
1.78	16
1.87	17
1.95	18
2.04	19
2.13	20
2.22	21
2.30	22
2.39	23
2.47	24
2.55	25
2.65	26
2.74	27
2.84	28
2.92	29
3.02	30
3.09	31
3.17	32
3.26	33
3.35	34
3.43	35
3.52	36
3.61	37
3.69	38
3.78	39
3.87	40
3.95	41
4.04	42
4.14	43
4.22	44
4.32	45
4.41	46
4.51	47
4.60	48
4.70	49
4.79	50
4.88	51
4.97	52
5.07	53
5.17	54
5.28	55
5.40	56
5.50	57
5.61	58
5.72	59
5.83	60
5.95	61
6.05	62
6.17	63
6.30	64
6.43	65
6.55	66
6.67	67
6.79	68
6.92	69
7.05	70
7.19	71
7.34	72
7.50	73
7.65	74
7.80	75
7.96	76
8.16	77
8.32	78
8.47	79
8.66	80
8.85	81
9.05	82
9.26	83
9.51	84
9.77	85
10.03	86
10.26	87
10.54	88
10.84	89
11.18	90
11.55	91
12.01	92
12.41	93
12.91	94
13.44	95
14.23	96
15.03	97
16.15	98
18.35	99
29.38	100