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
0.02	2
0.02	3
0.03	4
0.03	5
0.04	6
0.04	7
0.05	8
0.06	9
0.06	10
0.07	11
0.08	12
0.08	13
0.09	14
0.10	15
0.11	16
0.12	17
0.13	18
0.13	19
0.14	20
0.15	21
0.16	22
0.17	23
0.18	24
0.18	25
0.19	26
0.21	27
0.21	28
0.22	29
0.24	30
0.25	31
0.26	32
0.27	33
0.28	34
0.29	35
0.30	36
0.31	37
0.33	38
0.34	39
0.35	40
0.36	41
0.38	42
0.39	43
0.40	44
0.42	45
0.43	46
0.44	47
0.46	48
0.47	49
0.49	50
0.50	51
0.52	52
0.54	53
0.55	54
0.57	55
0.59	56
0.61	57
0.62	58
0.64	59
0.66	60
0.69	61
0.71	62
0.73	63
0.75	64
0.78	65
0.80	66
0.83	67
0.86	68
0.89	69
0.91	70
0.95	71
0.98	72
1.02	73
1.06	74
1.09	75
1.14	76
1.18	77
1.22	78
1.27	79
1.32	80
1.38	81
1.42	82
1.48	83
1.55	84
1.62	85
1.69	86
1.77	87
1.85	88
1.93	89
2.05	90
2.16	91
2.30	92
2.46	93
2.64	94
2.86	95
3.15	96
3.54	97
4.08	98
4.95	99
8.93	100