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
0.34	1
0.43	2
0.54	3
0.61	4
0.71	5
0.80	6
0.86	7
0.91	8
0.97	9
1.04	10
1.09	11
1.15	12
1.19	13
1.23	14
1.27	15
1.31	16
1.35	17
1.39	18
1.46	19
1.52	20
1.56	21
1.60	22
1.63	23
1.66	24
1.70	25
1.74	26
1.78	27
1.82	28
1.86	29
1.92	30
1.96	31
1.99	32
2.05	33
2.09	34
2.14	35
2.18	36
2.23	37
2.29	38
2.33	39
2.38	40
2.40	41
2.45	42
2.48	43
2.52	44
2.57	45
2.62	46
2.66	47
2.70	48
2.74	49
2.78	50
2.83	51
2.88	52
2.93	53
2.97	54
3.03	55
3.09	56
3.13	57
3.20	58
3.25	59
3.29	60
3.34	61
3.38	62
3.44	63
3.49	64
3.55	65
3.60	66
3.69	67
3.77	68
3.83	69
3.90	70
4.00	71
4.10	72
4.15	73
4.27	74
4.38	75
4.51	76
4.60	77
4.70	78
4.83	79
4.94	80
5.11	81
5.28	82
5.49	83
5.74	84
5.95	85
6.29	86
6.56	87
6.75	88
7.20	89
7.65	90
8.32	91
8.74	92
9.26	93
9.97	94
10.79	95
12.03	96
13.60	97
17.85	98
26.12	99
227.00	100