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
0.37	1
0.52	2
0.60	3
0.68	4
0.75	5
0.81	6
0.88	7
0.94	8
1.00	9
1.04	10
1.09	11
1.15	12
1.20	13
1.24	14
1.28	15
1.32	16
1.36	17
1.42	18
1.47	19
1.50	20
1.55	21
1.60	22
1.63	23
1.67	24
1.71	25
1.75	26
1.80	27
1.83	28
1.85	29
1.89	30
1.93	31
1.97	32
2.01	33
2.05	34
2.09	35
2.12	36
2.17	37
2.21	38
2.24	39
2.28	40
2.34	41
2.39	42
2.45	43
2.49	44
2.55	45
2.59	46
2.63	47
2.66	48
2.73	49
2.78	50
2.80	51
2.83	52
2.87	53
2.91	54
2.94	55
2.97	56
3.02	57
3.06	58
3.10	59
3.13	60
3.18	61
3.25	62
3.30	63
3.35	64
3.41	65
3.46	66
3.51	67
3.56	68
3.64	69
3.73	70
3.80	71
3.89	72
3.96	73
4.06	74
4.14	75
4.27	76
4.34	77
4.46	78
4.57	79
4.70	80
4.87	81
5.03	82
5.20	83
5.42	84
5.55	85
5.67	86
5.97	87
6.23	88
6.58	89
6.86	90
7.26	91
7.75	92
8.32	93
8.98	94
9.63	95
10.75	96
11.97	97
14.85	98
28.10	99
930.00	100