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
0.24	1
0.37	2
0.47	3
0.58	4
0.68	5
0.80	6
0.89	7
1.02	8
1.10	9
1.20	10
1.29	11
1.40	12
1.51	13
1.60	14
1.68	15
1.78	16
1.88	17
2.01	18
2.08	19
2.18	20
2.27	21
2.37	22
2.46	23
2.56	24
2.67	25
2.76	26
2.86	27
3.00	28
3.04	29
3.15	30
3.26	31
3.35	32
3.45	33
3.56	34
3.67	35
3.76	36
3.86	37
4.01	38
4.07	39
4.17	40
4.28	41
4.39	42
4.51	43
4.62	44
4.72	45
4.84	46
4.95	47
5.08	48
5.20	49
5.31	50
5.45	51
5.57	52
5.69	53
5.82	54
6.00	55
6.08	56
6.22	57
6.36	58
6.51	59
6.62	60
6.76	61
6.89	62
7.05	63
7.20	64
7.35	65
7.51	66
7.67	67
7.83	68
8.02	69
8.16	70
8.34	71
8.52	72
8.72	73
8.90	74
9.11	75
9.34	76
9.54	77
9.76	78
10.01	79
10.19	80
10.45	81
10.68	82
11.01	83
11.25	84
11.55	85
11.87	86
12.21	87
12.57	88
13.01	89
13.39	90
13.88	91
14.41	92
15.01	93
15.63	94
16.30	95
17.18	96
18.27	97
19.77	98
22.03	99
30.00	100