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
0.06	1
0.10	2
0.11	3
0.12	4
0.12	5
0.14	6
0.15	7
0.16	8
0.17	9
0.19	10
0.20	11
0.21	12
0.22	13
0.22	14
0.23	15
0.24	16
0.25	17
0.25	18
0.26	19
0.27	20
0.28	21
0.28	22
0.30	23
0.31	24
0.32	25
0.33	26
0.33	27
0.34	28
0.35	29
0.36	30
0.38	31
0.39	32
0.41	33
0.42	34
0.44	35
0.46	36
0.47	37
0.48	38
0.50	39
0.51	40
0.54	41
0.56	42
0.57	43
0.58	44
0.59	45
0.61	46
0.62	47
0.62	48
0.65	49
0.67	50
0.70	51
0.72	52
0.72	53
0.74	54
0.76	55
0.78	56
0.79	57
0.81	58
0.84	59
0.86	60
0.87	61
0.89	62
0.92	63
1.02	64
1.07	65
1.11	66
1.14	67
1.17	68
1.20	69
1.23	70
1.32	71
1.38	72
1.47	73
1.53	74
1.59	75
1.66	76
1.76	77
1.83	78
1.97	79
2.02	80
2.14	81
2.46	82
2.57	83
2.70	84
2.87	85
3.00	86
3.05	87
3.14	88
3.35	89
3.66	90
3.75	91
4.32	92
4.62	93
5.57	94
6.77	95
8.60	96
9.93	97
11.48	98
32.31	99
239.00	100