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
0.02	4
0.03	5
0.03	6
0.04	7
0.04	8
0.05	9
0.06	10
0.06	11
0.07	12
0.07	13
0.08	14
0.09	15
0.09	16
0.10	17
0.10	18
0.11	19
0.12	20
0.12	21
0.13	22
0.13	23
0.14	24
0.14	25
0.15	26
0.15	27
0.16	28
0.16	29
0.17	30
0.18	31
0.18	32
0.19	33
0.19	34
0.20	35
0.20	36
0.21	37
0.21	38
0.22	39
0.23	40
0.23	41
0.24	42
0.25	43
0.25	44
0.26	45
0.27	46
0.27	47
0.28	48
0.29	49
0.29	50
0.30	51
0.31	52
0.32	53
0.33	54
0.34	55
0.35	56
0.36	57
0.37	58
0.38	59
0.39	60
0.40	61
0.41	62
0.42	63
0.43	64
0.44	65
0.46	66
0.47	67
0.48	68
0.49	69
0.51	70
0.52	71
0.54	72
0.55	73
0.57	74
0.58	75
0.60	76
0.62	77
0.64	78
0.66	79
0.68	80
0.70	81
0.73	82
0.75	83
0.78	84
0.81	85
0.84	86
0.87	87
0.91	88
0.95	89
1.00	90
1.05	91
1.12	92
1.20	93
1.28	94
1.41	95
1.55	96
1.75	97
2.02	98
2.73	99
12.41	100