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
0.01	1
0.01	2
0.02	3
0.02	4
0.03	5
0.03	6
0.04	7
0.05	8
0.05	9
0.06	10
0.07	11
0.08	12
0.09	13
0.09	14
0.10	15
0.12	16
0.13	17
0.14	18
0.15	19
0.16	20
0.18	21
0.19	22
0.20	23
0.21	24
0.23	25
0.24	26
0.26	27
0.28	28
0.29	29
0.30	30
0.32	31
0.35	32
0.36	33
0.39	34
0.40	35
0.42	36
0.45	37
0.47	38
0.50	39
0.51	40
0.54	41
0.56	42
0.59	43
0.63	44
0.65	45
0.68	46
0.72	47
0.74	48
0.77	49
0.80	50
0.83	51
0.86	52
0.91	53
0.94	54
1.01	55
1.02	56
1.06	57
1.12	58
1.17	59
1.25	60
1.26	61
1.33	62
1.43	63
1.44	64
1.52	65
1.58	66
1.68	67
1.70	68
1.82	69
2.00	70
2.01	71
2.02	72
2.23	73
2.35	74
2.53	75
2.56	76
2.59	77
2.86	78
3.02	79
3.07	80
3.36	81
3.39	82
3.43	83
3.80	84
4.06	85
4.48	86
5.04	87
5.09	88
5.14	89
5.18	90
6.37	91
6.74	92
9.87	93
10.34	94
10.68	95
11.03	96
11.37	97
11.72	98
13.05	99
30.00	100