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
0.25	1
0.38	2
0.51	3
0.61	4
0.75	5
0.86	6
1.00	7
1.07	8
1.17	9
1.28	10
1.38	11
1.47	12
1.58	13
1.67	14
1.78	15
1.88	16
2.01	17
2.07	18
2.18	19
2.29	20
2.38	21
2.50	22
2.58	23
2.68	24
2.78	25
2.88	26
3.02	27
3.09	28
3.21	29
3.30	30
3.40	31
3.51	32
3.61	33
3.72	34
3.81	35
3.91	36
4.03	37
4.13	38
4.23	39
4.34	40
4.45	41
4.56	42
4.68	43
4.80	44
4.90	45
5.03	46
5.13	47
5.25	48
5.37	49
5.50	50
5.61	51
5.74	52
5.86	53
6.02	54
6.12	55
6.25	56
6.40	57
6.53	58
6.67	59
6.81	60
6.95	61
7.10	62
7.25	63
7.40	64
7.56	65
7.71	66
7.87	67
8.04	68
8.21	69
8.39	70
8.56	71
8.73	72
8.92	73
9.11	74
9.31	75
9.53	76
9.75	77
10.01	78
10.21	79
10.45	80
10.70	81
11.01	82
11.26	83
11.56	84
11.88	85
12.20	86
12.53	87
12.88	88
13.31	89
13.75	90
14.20	91
14.72	92
15.29	93
16.00	94
16.70	95
17.61	96
18.77	97
20.18	98
22.64	99
30.00	100