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
0.38	2
0.50	3
0.61	4
0.72	5
0.82	6
0.91	7
1.03	8
1.13	9
1.23	10
1.34	11
1.44	12
1.55	13
1.64	14
1.75	15
1.84	16
2.00	17
2.03	18
2.15	19
2.24	20
2.34	21
2.43	22
2.54	23
2.63	24
2.73	25
2.83	26
2.93	27
3.04	28
3.15	29
3.25	30
3.35	31
3.45	32
3.56	33
3.67	34
3.75	35
3.85	36
4.01	37
4.07	38
4.18	39
4.29	40
4.40	41
4.51	42
4.61	43
4.72	44
4.82	45
4.93	46
5.04	47
5.17	48
5.29	49
5.41	50
5.54	51
5.67	52
5.80	53
5.92	54
6.04	55
6.18	56
6.31	57
6.45	58
6.58	59
6.73	60
6.86	61
7.02	62
7.15	63
7.29	64
7.45	65
7.61	66
7.77	67
7.93	68
8.09	69
8.26	70
8.46	71
8.64	72
8.82	73
9.03	74
9.22	75
9.43	76
9.64	77
9.88	78
10.10	79
10.34	80
10.60	81
10.85	82
11.15	83
11.46	84
11.76	85
12.03	86
12.40	87
12.80	88
13.20	89
13.63	90
14.10	91
14.60	92
15.18	93
15.78	94
16.58	95
17.49	96
18.62	97
20.01	98
22.20	99
30.00	100