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
0.12	1
0.29	2
0.44	3
0.60	4
0.70	5
0.79	6
0.86	7
0.97	8
1.02	9
1.09	10
1.16	11
1.23	12
1.27	13
1.32	14
1.37	15
1.41	16
1.48	17
1.54	18
1.59	19
1.64	20
1.70	21
1.74	22
1.78	23
1.83	24
1.88	25
1.92	26
1.98	27
2.03	28
2.09	29
2.13	30
2.19	31
2.24	32
2.28	33
2.33	34
2.37	35
2.41	36
2.45	37
2.50	38
2.54	39
2.59	40
2.63	41
2.69	42
2.72	43
2.79	44
2.85	45
2.90	46
2.96	47
3.01	48
3.06	49
3.11	50
3.16	51
3.22	52
3.26	53
3.34	54
3.38	55
3.44	56
3.50	57
3.54	58
3.61	59
3.67	60
3.72	61
3.79	62
3.86	63
3.91	64
3.97	65
4.01	66
4.10	67
4.17	68
4.23	69
4.30	70
4.37	71
4.45	72
4.55	73
4.60	74
4.69	75
4.73	76
4.80	77
4.88	78
4.96	79
5.06	80
5.16	81
5.28	82
5.41	83
5.53	84
5.63	85
5.75	86
5.90	87
6.08	88
6.22	89
6.41	90
6.61	91
6.81	92
7.00	93
7.25	94
7.55	95
8.08	96
8.75	97
9.52	98
11.20	99
17.91	100