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
0.09	9
0.10	10
0.11	11
0.13	12
0.14	13
0.16	14
0.17	15
0.19	16
0.20	17
0.22	18
0.23	19
0.25	20
0.26	21
0.28	22
0.30	23
0.32	24
0.34	25
0.35	26
0.37	27
0.39	28
0.40	29
0.42	30
0.44	31
0.46	32
0.48	33
0.51	34
0.52	35
0.54	36
0.56	37
0.58	38
0.61	39
0.63	40
0.64	41
0.67	42
0.69	43
0.71	44
0.73	45
0.76	46
0.78	47
0.81	48
0.83	49
0.86	50
0.88	51
0.91	52
0.95	53
0.97	54
1.01	55
1.04	56
1.07	57
1.10	58
1.13	59
1.17	60
1.20	61
1.24	62
1.28	63
1.32	64
1.36	65
1.41	66
1.45	67
1.50	68
1.55	69
1.59	70
1.65	71
1.69	72
1.75	73
1.81	74
1.87	75
1.93	76
2.02	77
2.08	78
2.15	79
2.23	80
2.31	81
2.39	82
2.51	83
2.59	84
2.70	85
2.80	86
2.91	87
3.04	88
3.18	89
3.34	90
3.50	91
3.68	92
3.91	93
4.16	94
4.47	95
4.80	96
5.26	97
5.89	98
6.87	99
14.09	100