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
0.07	1
0.11	2
0.14	3
0.18	4
0.22	5
0.25	6
0.29	7
0.33	8
0.36	9
0.40	10
0.44	11
0.48	12
0.51	13
0.55	14
0.60	15
0.64	16
0.68	17
0.72	18
0.76	19
0.80	20
0.85	21
0.89	22
0.93	23
0.98	24
1.03	25
1.08	26
1.13	27
1.18	28
1.24	29
1.28	30
1.33	31
1.39	32
1.45	33
1.50	34
1.57	35
1.65	36
1.71	37
1.79	38
1.86	39
1.93	40
2.00	41
2.08	42
2.17	43
2.26	44
2.33	45
2.43	46
2.53	47
2.63	48
2.73	49
2.83	50
2.96	51
3.08	52
3.20	53
3.33	54
3.45	55
3.58	56
3.71	57
3.88	58
4.02	59
4.21	60
4.38	61
4.57	62
4.71	63
4.91	64
5.11	65
5.33	66
5.58	67
5.81	68
6.00	69
6.27	70
6.59	71
6.87	72
7.20	73
7.50	74
7.90	75
8.21	76
8.60	77
9.01	78
9.54	79
10.00	80
10.50	81
11.07	82
11.68	83
12.35	84
13.00	85
13.74	86
14.49	87
15.14	88
16.17	89
17.34	90
18.76	91
20.14	92
22.37	93
24.62	94
27.58	95
30.93	96
35.93	97
43.08	98
54.07	99
116.00	100