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
0.35	1
0.43	2
0.48	3
0.58	4
0.62	5
0.69	6
0.76	7
0.82	8
0.90	9
0.91	10
0.97	11
1.04	12
1.07	13
1.14	14
1.19	15
1.24	16
1.27	17
1.30	18
1.35	19
1.37	20
1.41	21
1.44	22
1.47	23
1.50	24
1.52	25
1.61	26
1.66	27
1.69	28
1.72	29
1.76	30
1.78	31
1.81	32
1.86	33
1.90	34
1.92	35
1.95	36
1.99	37
2.01	38
2.04	39
2.06	40
2.10	41
2.13	42
2.15	43
2.17	44
2.19	45
2.21	46
2.25	47
2.27	48
2.29	49
2.30	50
2.34	51
2.41	52
2.45	53
2.49	54
2.56	55
2.58	56
2.62	57
2.63	58
2.64	59
2.69	60
2.73	61
2.79	62
2.81	63
2.88	64
2.93	65
3.00	66
3.05	67
3.08	68
3.14	69
3.18	70
3.21	71
3.23	72
3.27	73
3.31	74
3.36	75
3.37	76
3.46	77
3.50	78
3.60	79
3.66	80
3.74	81
3.81	82
3.88	83
3.98	84
4.06	85
4.17	86
4.25	87
4.51	88
4.64	89
4.84	90
4.93	91
5.19	92
5.42	93
5.80	94
6.07	95
7.21	96
7.43	97
8.09	98
8.33	99
9.15	100