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
0.08	9
0.09	10
0.11	11
0.13	12
0.14	13
0.16	14
0.17	15
0.20	16
0.22	17
0.23	18
0.25	19
0.26	20
0.27	21
0.29	22
0.30	23
0.31	24
0.32	25
0.34	26
0.35	27
0.36	28
0.37	29
0.38	30
0.39	31
0.40	32
0.41	33
0.42	34
0.43	35
0.44	36
0.45	37
0.46	38
0.48	39
0.50	40
0.51	41
0.52	42
0.53	43
0.55	44
0.56	45
0.57	46
0.59	47
0.61	48
0.62	49
0.64	50
0.67	51
0.68	52
0.69	53
0.72	54
0.73	55
0.75	56
0.77	57
0.80	58
0.82	59
0.84	60
0.86	61
0.88	62
0.91	63
0.92	64
0.95	65
0.96	66
1.00	67
1.02	68
1.04	69
1.07	70
1.10	71
1.12	72
1.16	73
1.18	74
1.22	75
1.25	76
1.29	77
1.32	78
1.36	79
1.41	80
1.45	81
1.50	82
1.55	83
1.60	84
1.67	85
1.72	86
1.78	87
1.85	88
1.92	89
2.01	90
2.10	91
2.22	92
2.35	93
2.51	94
2.72	95
3.01	96
3.38	97
3.96	98
5.01	99
14.47	100