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
0.19	1
0.34	2
0.49	3
0.61	4
0.73	5
0.83	6
0.92	7
1.01	8
1.09	9
1.17	10
1.26	11
1.35	12
1.42	13
1.50	14
1.57	15
1.64	16
1.71	17
1.79	18
1.85	19
1.93	20
1.99	21
2.05	22
2.12	23
2.19	24
2.26	25
2.32	26
2.39	27
2.47	28
2.54	29
2.61	30
2.67	31
2.74	32
2.81	33
2.89	34
2.96	35
3.02	36
3.09	37
3.16	38
3.22	39
3.30	40
3.37	41
3.44	42
3.51	43
3.60	44
3.66	45
3.73	46
3.80	47
3.88	48
3.95	49
4.02	50
4.09	51
4.16	52
4.23	53
4.30	54
4.39	55
4.46	56
4.54	57
4.63	58
4.70	59
4.79	60
4.88	61
4.97	62
5.07	63
5.17	64
5.26	65
5.35	66
5.46	67
5.57	68
5.67	69
5.77	70
5.88	71
6.00	72
6.12	73
6.24	74
6.36	75
6.47	76
6.59	77
6.76	78
6.90	79
7.04	80
7.21	81
7.39	82
7.55	83
7.74	84
7.91	85
8.11	86
8.32	87
8.55	88
8.77	89
9.04	90
9.32	91
9.64	92
10.02	93
10.43	94
10.89	95
11.54	96
12.27	97
13.46	98
15.23	99
25.14	100