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
0.23	1
0.34	2
0.45	3
0.57	4
0.67	5
0.76	6
0.86	7
0.93	8
1.04	9
1.13	10
1.21	11
1.32	12
1.41	13
1.51	14
1.60	15
1.69	16
1.78	17
1.86	18
2.01	19
2.04	20
2.16	21
2.25	22
2.34	23
2.42	24
2.52	25
2.60	26
2.69	27
2.78	28
2.88	29
3.01	30
3.06	31
3.15	32
3.24	33
3.34	34
3.43	35
3.55	36
3.64	37
3.75	38
3.85	39
4.00	40
4.04	41
4.17	42
4.27	43
4.37	44
4.50	45
4.59	46
4.70	47
4.81	48
4.92	49
5.04	50
5.15	51
5.26	52
5.38	53
5.50	54
5.61	55
5.73	56
5.84	57
6.01	58
6.09	59
6.22	60
6.35	61
6.51	62
6.63	63
6.78	64
6.92	65
7.08	66
7.23	67
7.38	68
7.54	69
7.70	70
7.87	71
8.03	72
8.21	73
8.40	74
8.58	75
8.77	76
9.01	77
9.19	78
9.43	79
9.64	80
9.88	81
10.13	82
10.38	83
10.67	84
10.92	85
11.23	86
11.56	87
11.90	88
12.30	89
12.72	90
13.13	91
13.60	92
14.14	93
14.72	94
15.43	95
16.27	96
17.27	97
18.66	98
20.87	99
29.90	100