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
0.35	2
0.45	3
0.57	4
0.68	5
0.77	6
0.86	7
1.00	8
1.05	9
1.15	10
1.25	11
1.34	12
1.43	13
1.52	14
1.61	15
1.70	16
1.80	17
1.88	18
2.02	19
2.07	20
2.17	21
2.26	22
2.36	23
2.45	24
2.55	25
2.63	26
2.73	27
2.82	28
2.91	29
3.03	30
3.11	31
3.22	32
3.31	33
3.41	34
3.51	35
3.60	36
3.69	37
3.80	38
3.90	39
4.02	40
4.11	41
4.22	42
4.33	43
4.43	44
4.55	45
4.65	46
4.76	47
4.86	48
5.01	49
5.09	50
5.21	51
5.34	52
5.45	53
5.58	54
5.69	55
5.82	56
6.00	57
6.08	58
6.22	59
6.34	60
6.50	61
6.62	62
6.76	63
6.91	64
7.06	65
7.20	66
7.36	67
7.53	68
7.70	69
7.85	70
8.02	71
8.20	72
8.37	73
8.57	74
8.76	75
8.95	76
9.15	77
9.37	78
9.59	79
9.84	80
10.07	81
10.31	82
10.57	83
10.82	84
11.10	85
11.40	86
11.75	87
12.08	88
12.44	89
12.85	90
13.27	91
13.81	92
14.35	93
15.02	94
15.68	95
16.52	96
17.54	97
19.03	98
21.26	99
30.00	100