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
0.05	3
0.05	4
0.06	5
0.08	6
0.10	7
0.11	8
0.13	9
0.14	10
0.15	11
0.17	12
0.18	13
0.20	14
0.22	15
0.23	16
0.24	17
0.26	18
0.27	19
0.28	20
0.29	21
0.30	22
0.32	23
0.33	24
0.34	25
0.35	26
0.36	27
0.37	28
0.38	29
0.39	30
0.40	31
0.41	32
0.42	33
0.44	34
0.45	35
0.46	36
0.47	37
0.48	38
0.50	39
0.51	40
0.52	41
0.53	42
0.55	43
0.56	44
0.58	45
0.59	46
0.61	47
0.63	48
0.64	49
0.66	50
0.67	51
0.69	52
0.72	53
0.73	54
0.75	55
0.77	56
0.79	57
0.81	58
0.83	59
0.86	60
0.87	61
0.90	62
0.91	63
0.94	64
0.96	65
1.00	66
1.01	67
1.04	68
1.06	69
1.09	70
1.11	71
1.15	72
1.18	73
1.21	74
1.25	75
1.28	76
1.31	77
1.36	78
1.40	79
1.44	80
1.50	81
1.54	82
1.58	83
1.63	84
1.70	85
1.77	86
1.84	87
1.93	88
2.04	89
2.13	90
2.24	91
2.37	92
2.51	93
2.68	94
2.91	95
3.21	96
3.57	97
4.11	98
5.11	99
13.64	100