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
0.24	1
0.38	2
0.52	3
0.67	4
0.79	5
0.90	6
1.02	7
1.11	8
1.22	9
1.31	10
1.41	11
1.51	12
1.58	13
1.67	14
1.76	15
1.85	16
1.93	17
2.02	18
2.11	19
2.20	20
2.30	21
2.39	22
2.48	23
2.57	24
2.66	25
2.75	26
2.84	27
2.92	28
3.02	29
3.11	30
3.20	31
3.30	32
3.39	33
3.47	34
3.55	35
3.63	36
3.71	37
3.79	38
3.89	39
3.96	40
4.06	41
4.15	42
4.23	43
4.34	44
4.43	45
4.52	46
4.61	47
4.71	48
4.81	49
4.91	50
5.02	51
5.12	52
5.23	53
5.34	54
5.43	55
5.54	56
5.65	57
5.77	58
5.90	59
6.02	60
6.12	61
6.25	62
6.36	63
6.48	64
6.61	65
6.76	66
6.89	67
7.02	68
7.14	69
7.27	70
7.42	71
7.57	72
7.72	73
7.85	74
8.01	75
8.15	76
8.31	77
8.50	78
8.67	79
8.88	80
9.08	81
9.28	82
9.47	83
9.68	84
9.89	85
10.11	86
10.37	87
10.69	88
11.04	89
11.41	90
11.80	91
12.20	92
12.66	93
13.15	94
13.76	95
14.56	96
15.50	97
16.71	98
18.75	99
28.71	100