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
0.07	1
0.10	2
0.14	3
0.16	4
0.19	5
0.22	6
0.25	7
0.28	8
0.30	9
0.33	10
0.36	11
0.40	12
0.42	13
0.46	14
0.49	15
0.54	16
0.57	17
0.60	18
0.64	19
0.67	20
0.69	21
0.71	22
0.75	23
0.78	24
0.81	25
0.85	26
0.89	27
0.92	28
0.96	29
1.01	30
1.06	31
1.11	32
1.15	33
1.21	34
1.25	35
1.30	36
1.34	37
1.40	38
1.45	39
1.53	40
1.59	41
1.64	42
1.70	43
1.76	44
1.83	45
1.90	46
1.96	47
2.05	48
2.13	49
2.21	50
2.30	51
2.39	52
2.47	53
2.58	54
2.69	55
2.79	56
2.88	57
3.01	58
3.15	59
3.24	60
3.37	61
3.50	62
3.66	63
3.80	64
3.96	65
4.11	66
4.27	67
4.43	68
4.62	69
4.93	70
5.18	71
5.38	72
5.68	73
6.00	74
6.29	75
6.58	76
6.92	77
7.17	78
7.58	79
7.91	80
8.41	81
8.94	82
9.46	83
10.06	84
10.72	85
11.60	86
12.28	87
12.98	88
14.01	89
15.33	90
16.66	91
18.53	92
20.98	93
23.34	94
26.74	95
30.99	96
37.32	97
44.98	98
69.98	99
197.00	100