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
0.04	1
0.05	2
0.05	3
0.06	4
0.07	5
0.09	6
0.10	7
0.11	8
0.13	9
0.14	10
0.16	11
0.18	12
0.20	13
0.21	14
0.23	15
0.24	16
0.26	17
0.28	18
0.29	19
0.31	20
0.32	21
0.34	22
0.36	23
0.37	24
0.39	25
0.41	26
0.42	27
0.44	28
0.46	29
0.48	30
0.50	31
0.52	32
0.54	33
0.56	34
0.58	35
0.60	36
0.62	37
0.64	38
0.66	39
0.68	40
0.70	41
0.72	42
0.74	43
0.77	44
0.79	45
0.81	46
0.84	47
0.86	48
0.89	49
0.91	50
0.95	51
0.97	52
1.01	53
1.04	54
1.06	55
1.10	56
1.13	57
1.16	58
1.19	59
1.23	60
1.27	61
1.30	62
1.34	63
1.38	64
1.41	65
1.46	66
1.51	67
1.55	68
1.59	69
1.64	70
1.68	71
1.74	72
1.79	73
1.85	74
1.91	75
1.95	76
2.03	77
2.08	78
2.15	79
2.22	80
2.30	81
2.37	82
2.45	83
2.53	84
2.63	85
2.72	86
2.82	87
2.94	88
3.06	89
3.21	90
3.36	91
3.53	92
3.70	93
3.88	94
4.15	95
4.46	96
4.89	97
5.42	98
6.28	99
11.05	100