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
0.04	4
0.05	5
0.05	6
0.06	7
0.06	8
0.07	9
0.08	10
0.08	11
0.09	12
0.10	13
0.11	14
0.11	15
0.12	16
0.13	17
0.14	18
0.15	19
0.16	20
0.17	21
0.19	22
0.20	23
0.22	24
0.24	25
0.25	26
0.26	27
0.28	28
0.29	29
0.30	30
0.32	31
0.32	32
0.34	33
0.35	34
0.37	35
0.38	36
0.39	37
0.40	38
0.42	39
0.42	40
0.44	41
0.45	42
0.46	43
0.48	44
0.50	45
0.51	46
0.52	47
0.53	48
0.55	49
0.56	50
0.57	51
0.59	52
0.60	53
0.63	54
0.63	55
0.65	56
0.67	57
0.69	58
0.72	59
0.73	60
0.76	61
0.77	62
0.79	63
0.81	64
0.84	65
0.86	66
0.88	67
0.91	68
0.92	69
0.95	70
0.97	71
1.01	72
1.02	73
1.05	74
1.07	75
1.10	76
1.12	77
1.16	78
1.18	79
1.22	80
1.25	81
1.29	82
1.33	83
1.37	84
1.41	85
1.46	86
1.52	87
1.58	88
1.65	89
1.73	90
1.81	91
1.91	92
2.03	93
2.16	94
2.35	95
2.55	96
2.92	97
3.41	98
4.33	99
16.04	100