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
0.36	2
0.47	3
0.58	4
0.68	5
0.80	6
0.89	7
1.02	8
1.09	9
1.20	10
1.28	11
1.39	12
1.50	13
1.58	14
1.67	15
1.77	16
1.86	17
2.00	18
2.03	19
2.15	20
2.23	21
2.34	22
2.42	23
2.52	24
2.62	25
2.72	26
2.80	27
2.90	28
3.02	29
3.11	30
3.21	31
3.30	32
3.40	33
3.51	34
3.60	35
3.68	36
3.78	37
3.89	38
4.02	39
4.11	40
4.22	41
4.34	42
4.43	43
4.54	44
4.65	45
4.76	46
4.87	47
5.01	48
5.11	49
5.22	50
5.35	51
5.46	52
5.58	53
5.70	54
5.83	55
6.01	56
6.09	57
6.23	58
6.36	59
6.51	60
6.64	61
6.80	62
6.93	63
7.09	64
7.23	65
7.40	66
7.56	67
7.72	68
7.88	69
8.04	70
8.22	71
8.40	72
8.58	73
8.77	74
9.00	75
9.15	76
9.35	77
9.58	78
9.81	79
10.03	80
10.26	81
10.52	82
10.81	83
11.10	84
11.38	85
11.69	86
12.03	87
12.35	88
12.74	89
13.18	90
13.63	91
14.13	92
14.69	93
15.26	94
16.03	95
16.89	96
17.93	97
19.42	98
21.68	99
30.00	100