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
0.09	2
0.11	3
0.12	4
0.15	5
0.17	6
0.19	7
0.21	8
0.22	9
0.23	10
0.24	11
0.25	12
0.27	13
0.29	14
0.31	15
0.33	16
0.35	17
0.37	18
0.39	19
0.42	20
0.45	21
0.46	22
0.48	23
0.51	24
0.53	25
0.55	26
0.56	27
0.58	28
0.60	29
0.63	30
0.65	31
0.67	32
0.70	33
0.73	34
0.75	35
0.78	36
0.80	37
0.84	38
0.88	39
0.92	40
0.94	41
0.98	42
1.01	43
1.05	44
1.08	45
1.11	46
1.15	47
1.21	48
1.26	49
1.33	50
1.38	51
1.43	52
1.48	53
1.53	54
1.59	55
1.63	56
1.68	57
1.76	58
1.84	59
1.89	60
1.96	61
2.01	62
2.10	63
2.20	64
2.26	65
2.37	66
2.46	67
2.58	68
2.67	69
2.82	70
2.96	71
3.08	72
3.23	73
3.38	74
3.61	75
3.70	76
3.97	77
4.13	78
4.39	79
4.65	80
4.88	81
5.11	82
5.44	83
5.78	84
6.21	85
6.69	86
7.36	87
8.11	88
9.10	89
10.03	90
11.17	91
12.29	92
14.61	93
16.37	94
19.90	95
23.94	96
29.36	97
40.93	98
96.30	99
231.00	100