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
0.10	10
0.12	11
0.14	12
0.16	13
0.18	14
0.19	15
0.21	16
0.23	17
0.24	18
0.26	19
0.27	20
0.29	21
0.29	22
0.30	23
0.32	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
0.44	35
0.45	36
0.46	37
0.48	38
0.48	39
0.50	40
0.51	41
0.53	42
0.53	43
0.55	44
0.57	45
0.59	46
0.60	47
0.62	48
0.63	49
0.65	50
0.67	51
0.69	52
0.70	53
0.72	54
0.74	55
0.76	56
0.77	57
0.80	58
0.82	59
0.84	60
0.86	61
0.88	62
0.91	63
0.93	64
0.95	65
0.97	66
1.01	67
1.02	68
1.05	69
1.07	70
1.11	71
1.14	72
1.16	73
1.20	74
1.23	75
1.26	76
1.30	77
1.34	78
1.37	79
1.41	80
1.45	81
1.51	82
1.55	83
1.60	84
1.65	85
1.72	86
1.78	87
1.86	88
1.93	89
2.03	90
2.14	91
2.25	92
2.40	93
2.59	94
2.77	95
3.06	96
3.48	97
4.05	98
4.95	99
15.29	100