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
0.06	6
0.06	7
0.08	8
0.09	9
0.11	10
0.13	11
0.15	12
0.17	13
0.19	14
0.20	15
0.22	16
0.23	17
0.25	18
0.26	19
0.27	20
0.29	21
0.30	22
0.31	23
0.32	24
0.33	25
0.34	26
0.35	27
0.36	28
0.37	29
0.38	30
0.39	31
0.40	32
0.42	33
0.42	34
0.44	35
0.45	36
0.46	37
0.48	38
0.49	39
0.51	40
0.52	41
0.53	42
0.55	43
0.56	44
0.57	45
0.59	46
0.61	47
0.63	48
0.64	49
0.67	50
0.67	51
0.69	52
0.71	53
0.73	54
0.75	55
0.77	56
0.79	57
0.81	58
0.84	59
0.86	60
0.88	61
0.90	62
0.92	63
0.95	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
1.35	78
1.39	79
1.43	80
1.47	81
1.51	82
1.58	83
1.62	84
1.67	85
1.74	86
1.81	87
1.88	88
1.95	89
2.06	90
2.16	91
2.29	92
2.45	93
2.63	94
2.85	95
3.11	96
3.47	97
4.07	98
5.03	99
14.17	100