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
0.31	1
0.46	2
0.58	3
0.69	4
0.80	5
0.89	6
0.97	7
1.05	8
1.12	9
1.20	10
1.27	11
1.35	12
1.43	13
1.50	14
1.57	15
1.64	16
1.71	17
1.79	18
1.87	19
1.94	20
2.01	21
2.09	22
2.16	23
2.24	24
2.33	25
2.40	26
2.49	27
2.56	28
2.64	29
2.72	30
2.80	31
2.90	32
3.00	33
3.06	34
3.15	35
3.24	36
3.33	37
3.42	38
3.53	39
3.62	40
3.72	41
3.82	42
3.93	43
4.03	44
4.17	45
4.27	46
4.37	47
4.50	48
4.61	49
4.72	50
4.84	51
4.99	52
5.11	53
5.24	54
5.37	55
5.52	56
5.67	57
5.84	58
6.00	59
6.19	60
6.34	61
6.51	62
6.71	63
6.89	64
7.07	65
7.30	66
7.51	67
7.75	68
8.00	69
8.25	70
8.50	71
8.75	72
9.01	73
9.38	74
9.74	75
10.10	76
10.50	77
10.90	78
11.29	79
11.77	80
12.26	81
12.75	82
13.34	83
13.92	84
14.59	85
15.34	86
16.27	87
17.17	88
18.11	89
19.32	90
20.51	91
22.00	92
23.50	93
25.51	94
28.03	95
31.07	96
35.01	97
41.52	98
52.00	99
144.00	100