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
1.09	8
1.19	9
1.29	10
1.39	11
1.50	12
1.60	13
1.69	14
1.80	15
1.89	16
2.02	17
2.11	18
2.21	19
2.31	20
2.41	21
2.52	22
2.61	23
2.72	24
2.81	25
2.91	26
3.03	27
3.12	28
3.22	29
3.34	30
3.43	31
3.53	32
3.63	33
3.74	34
3.84	35
3.94	36
4.03	37
4.17	38
4.27	39
4.37	40
4.48	41
4.59	42
4.69	43
4.81	44
4.91	45
5.04	46
5.15	47
5.26	48
5.40	49
5.51	50
5.63	51
5.76	52
5.88	53
6.03	54
6.15	55
6.29	56
6.44	57
6.57	58
6.70	59
6.85	60
7.01	61
7.13	62
7.27	63
7.43	64
7.58	65
7.74	66
7.91	67
8.08	68
8.26	69
8.43	70
8.60	71
8.78	72
9.01	73
9.17	74
9.38	75
9.58	76
9.81	77
10.04	78
10.27	79
10.54	80
10.81	81
11.06	82
11.31	83
11.63	84
11.93	85
12.26	86
12.58	87
12.93	88
13.35	89
13.78	90
14.26	91
14.80	92
15.37	93
16.02	94
16.77	95
17.64	96
18.76	97
20.31	98
22.57	99
30.00	100