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
0.19	25
0.20	26
0.21	27
0.22	28
0.23	29
0.24	30
0.25	31
0.26	32
0.27	33
0.28	34
0.29	35
0.31	36
0.32	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
0.48	49
0.49	50
0.51	51
0.52	52
0.54	53
0.56	54
0.58	55
0.60	56
0.62	57
0.64	58
0.66	59
0.68	60
0.70	61
0.72	62
0.75	63
0.77	64
0.80	65
0.82	66
0.85	67
0.88	68
0.91	69
0.94	70
0.97	71
1.01	72
1.05	73
1.09	74
1.13	75
1.17	76
1.22	77
1.26	78
1.31	79
1.36	80
1.42	81
1.48	82
1.54	83
1.61	84
1.69	85
1.77	86
1.85	87
1.95	88
2.04	89
2.15	90
2.27	91
2.40	92
2.57	93
2.81	94
3.04	95
3.33	96
3.76	97
4.30	98
5.16	99
10.39	100