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
0.04	3
0.05	4
0.05	5
0.05	6
0.06	7
0.07	8
0.07	9
0.08	10
0.09	11
0.10	12
0.12	13
0.13	14
0.15	15
0.17	16
0.18	17
0.21	18
0.22	19
0.24	20
0.26	21
0.27	22
0.29	23
0.30	24
0.31	25
0.32	26
0.34	27
0.35	28
0.36	29
0.36	30
0.37	31
0.39	32
0.39	33
0.41	34
0.42	35
0.43	36
0.44	37
0.46	38
0.47	39
0.48	40
0.50	41
0.51	42
0.53	43
0.53	44
0.55	45
0.56	46
0.58	47
0.59	48
0.61	49
0.63	50
0.65	51
0.67	52
0.69	53
0.70	54
0.72	55
0.74	56
0.76	57
0.78	58
0.80	59
0.83	60
0.85	61
0.87	62
0.88	63
0.91	64
0.93	65
0.95	66
0.97	67
1.01	68
1.03	69
1.05	70
1.07	71
1.11	72
1.13	73
1.16	74
1.20	75
1.23	76
1.26	77
1.30	78
1.35	79
1.38	80
1.43	81
1.48	82
1.52	83
1.57	84
1.62	85
1.67	86
1.74	87
1.83	88
1.91	89
2.01	90
2.12	91
2.24	92
2.40	93
2.55	94
2.76	95
3.00	96
3.33	97
3.87	98
4.85	99
14.47	100