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
0.10	11
0.11	12
0.13	13
0.14	14
0.16	15
0.18	16
0.20	17
0.22	18
0.24	19
0.25	20
0.27	21
0.28	22
0.29	23
0.30	24
0.32	25
0.33	26
0.34	27
0.35	28
0.36	29
0.37	30
0.38	31
0.39	32
0.40	33
0.42	34
0.42	35
0.44	36
0.45	37
0.46	38
0.48	39
0.49	40
0.51	41
0.52	42
0.53	43
0.55	44
0.56	45
0.58	46
0.59	47
0.61	48
0.63	49
0.64	50
0.66	51
0.67	52
0.69	53
0.71	54
0.73	55
0.75	56
0.77	57
0.79	58
0.81	59
0.84	60
0.86	61
0.88	62
0.91	63
0.91	64
0.94	65
0.96	66
1.00	67
1.02	68
1.04	69
1.06	70
1.08	71
1.11	72
1.15	73
1.18	74
1.20	75
1.25	76
1.29	77
1.32	78
1.36	79
1.40	80
1.43	81
1.49	82
1.54	83
1.58	84
1.64	85
1.70	86
1.76	87
1.83	88
1.92	89
2.02	90
2.12	91
2.23	92
2.36	93
2.54	94
2.76	95
3.04	96
3.39	97
4.01	98
4.95	99
14.47	100