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
0.56	4
0.67	5
0.76	6
0.86	7
1.00	8
1.04	9
1.13	10
1.22	11
1.33	12
1.41	13
1.51	14
1.60	15
1.68	16
1.78	17
1.87	18
2.01	19
2.04	20
2.16	21
2.25	22
2.34	23
2.44	24
2.55	25
2.63	26
2.73	27
2.82	28
2.91	29
3.03	30
3.11	31
3.21	32
3.31	33
3.40	34
3.51	35
3.60	36
3.70	37
3.80	38
3.90	39
4.02	40
4.11	41
4.21	42
4.31	43
4.41	44
4.52	45
4.63	46
4.74	47
4.85	48
5.00	49
5.09	50
5.20	51
5.34	52
5.45	53
5.57	54
5.68	55
5.80	56
5.93	57
6.05	58
6.20	59
6.34	60
6.46	61
6.61	62
6.76	63
6.90	64
7.07	65
7.21	66
7.37	67
7.53	68
7.69	69
7.86	70
8.03	71
8.18	72
8.34	73
8.52	74
8.71	75
8.91	76
9.11	77
9.31	78
9.56	79
9.78	80
10.03	81
10.27	82
10.52	83
10.80	84
11.09	85
11.38	86
11.71	87
12.06	88
12.43	89
12.82	90
13.26	91
13.81	92
14.35	93
14.94	94
15.61	95
16.46	96
17.44	97
18.89	98
21.23	99
30.00	100