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
0.20	1
0.34	2
0.48	3
0.61	4
0.74	5
0.84	6
0.94	7
1.04	8
1.12	9
1.21	10
1.29	11
1.38	12
1.46	13
1.52	14
1.60	15
1.68	16
1.74	17
1.81	18
1.88	19
1.95	20
2.02	21
2.11	22
2.18	23
2.25	24
2.32	25
2.39	26
2.45	27
2.53	28
2.61	29
2.68	30
2.74	31
2.81	32
2.88	33
2.95	34
3.02	35
3.09	36
3.16	37
3.24	38
3.30	39
3.37	40
3.45	41
3.52	42
3.59	43
3.66	44
3.74	45
3.81	46
3.88	47
3.96	48
4.03	49
4.11	50
4.19	51
4.27	52
4.34	53
4.42	54
4.50	55
4.58	56
4.65	57
4.73	58
4.82	59
4.90	60
4.98	61
5.08	62
5.17	63
5.26	64
5.36	65
5.46	66
5.56	67
5.66	68
5.75	69
5.87	70
6.00	71
6.12	72
6.24	73
6.37	74
6.50	75
6.63	76
6.76	77
6.89	78
7.03	79
7.17	80
7.34	81
7.50	82
7.67	83
7.88	84
8.07	85
8.24	86
8.45	87
8.67	88
8.90	89
9.18	90
9.48	91
9.79	92
10.15	93
10.59	94
11.05	95
11.65	96
12.39	97
13.59	98
15.47	99
25.61	100