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
0.10	10
0.12	11
0.13	12
0.14	13
0.16	14
0.17	15
0.19	16
0.21	17
0.23	18
0.24	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
0.47	32
0.48	33
0.51	34
0.52	35
0.54	36
0.56	37
0.59	38
0.61	39
0.64	40
0.66	41
0.68	42
0.70	43
0.72	44
0.75	45
0.77	46
0.80	47
0.82	48
0.84	49
0.87	50
0.90	51
0.93	52
0.95	53
1.00	54
1.02	55
1.05	56
1.08	57
1.11	58
1.14	59
1.17	60
1.21	61
1.24	62
1.28	63
1.32	64
1.35	65
1.40	66
1.44	67
1.48	68
1.53	69
1.59	70
1.63	71
1.68	72
1.74	73
1.81	74
1.88	75
1.94	76
2.01	77
2.08	78
2.17	79
2.25	80
2.33	81
2.41	82
2.50	83
2.60	84
2.69	85
2.80	86
2.92	87
3.04	88
3.18	89
3.36	90
3.52	91
3.70	92
3.92	93
4.19	94
4.51	95
4.89	96
5.30	97
5.95	98
6.97	99
14.09	100