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
0.03	1
0.04	2
0.05	3
0.05	4
0.06	5
0.07	6
0.08	7
0.09	8
0.10	9
0.11	10
0.12	11
0.13	12
0.14	13
0.16	14
0.17	15
0.19	16
0.21	17
0.22	18
0.23	19
0.25	20
0.27	21
0.28	22
0.30	23
0.32	24
0.34	25
0.35	26
0.37	27
0.39	28
0.41	29
0.43	30
0.45	31
0.46	32
0.48	33
0.51	34
0.53	35
0.55	36
0.57	37
0.59	38
0.61	39
0.64	40
0.65	41
0.68	42
0.70	43
0.72	44
0.74	45
0.76	46
0.79	47
0.81	48
0.84	49
0.86	50
0.89	51
0.92	52
0.96	53
1.00	54
1.02	55
1.05	56
1.08	57
1.11	58
1.15	59
1.18	60
1.22	61
1.25	62
1.30	63
1.34	64
1.38	65
1.42	66
1.46	67
1.52	68
1.56	69
1.60	70
1.65	71
1.70	72
1.75	73
1.82	74
1.88	75
1.94	76
2.01	77
2.07	78
2.14	79
2.22	80
2.29	81
2.39	82
2.49	83
2.59	84
2.70	85
2.81	86
2.92	87
3.05	88
3.19	89
3.34	90
3.51	91
3.67	92
3.90	93
4.16	94
4.46	95
4.81	96
5.28	97
5.91	98
6.94	99
14.09	100