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
0.46	3
0.57	4
0.67	5
0.77	6
0.86	7
1.00	8
1.05	9
1.15	10
1.24	11
1.34	12
1.43	13
1.52	14
1.61	15
1.71	16
1.80	17
1.88	18
2.01	19
2.08	20
2.18	21
2.27	22
2.37	23
2.46	24
2.55	25
2.64	26
2.73	27
2.83	28
2.92	29
3.03	30
3.12	31
3.22	32
3.34	33
3.43	34
3.52	35
3.61	36
3.72	37
3.82	38
3.92	39
4.03	40
4.13	41
4.23	42
4.34	43
4.45	44
4.56	45
4.67	46
4.77	47
4.88	48
5.01	49
5.11	50
5.23	51
5.35	52
5.47	53
5.60	54
5.72	55
5.84	56
6.01	57
6.10	58
6.24	59
6.38	60
6.52	61
6.65	62
6.78	63
6.92	64
7.07	65
7.22	66
7.38	67
7.53	68
7.68	69
7.86	70
8.04	71
8.21	72
8.38	73
8.57	74
8.77	75
9.00	76
9.16	77
9.38	78
9.60	79
9.84	80
10.06	81
10.31	82
10.58	83
10.84	84
11.15	85
11.45	86
11.80	87
12.15	88
12.51	89
12.91	90
13.36	91
13.87	92
14.39	93
15.03	94
15.72	95
16.54	96
17.60	97
19.08	98
21.34	99
30.00	100