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
0.71	5
0.83	6
0.93	7
1.04	8
1.13	9
1.22	10
1.32	11
1.41	12
1.50	13
1.60	14
1.69	15
1.78	16
1.88	17
1.95	18
2.04	19
2.13	20
2.22	21
2.31	22
2.40	23
2.48	24
2.57	25
2.65	26
2.75	27
2.84	28
2.92	29
3.01	30
3.09	31
3.17	32
3.25	33
3.34	34
3.42	35
3.51	36
3.59	37
3.69	38
3.76	39
3.84	40
3.93	41
4.02	42
4.11	43
4.21	44
4.32	45
4.41	46
4.51	47
4.60	48
4.70	49
4.79	50
4.89	51
5.01	52
5.09	53
5.20	54
5.30	55
5.40	56
5.51	57
5.60	58
5.71	59
5.82	60
5.92	61
6.03	62
6.16	63
6.27	64
6.41	65
6.52	66
6.64	67
6.77	68
6.89	69
7.02	70
7.16	71
7.30	72
7.48	73
7.63	74
7.80	75
7.97	76
8.13	77
8.30	78
8.51	79
8.68	80
8.87	81
9.06	82
9.28	83
9.48	84
9.72	85
10.01	86
10.24	87
10.51	88
10.83	89
11.19	90
11.54	91
11.91	92
12.40	93
12.87	94
13.42	95
14.12	96
15.02	97
16.21	98
18.34	99
29.43	100