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
0.08	1
0.10	2
0.13	3
0.14	4
0.16	5
0.17	6
0.19	7
0.20	8
0.22	9
0.25	10
0.26	11
0.28	12
0.29	13
0.33	14
0.34	15
0.35	16
0.38	17
0.41	18
0.43	19
0.46	20
0.51	21
0.51	22
0.56	23
0.59	24
0.63	25
0.65	26
0.69	27
0.72	28
0.76	29
0.80	30
0.84	31
0.88	32
0.90	33
1.00	34
1.01	35
1.03	36
1.04	37
1.10	38
1.15	39
1.17	40
1.20	41
1.26	42
1.28	43
1.34	44
1.40	45
1.40	46
1.43	47
1.51	48
1.55	49
1.60	50
1.65	51
1.68	52
1.75	53
1.76	54
1.80	55
1.86	56
1.91	57
2.01	58
2.02	59
2.06	60
2.13	61
2.20	62
2.27	63
2.34	64
2.34	65
2.35	66
2.43	67
2.52	68
2.62	69
2.67	70
2.75	71
2.81	72
2.89	73
3.01	74
3.03	75
3.11	76
3.22	77
3.34	78
3.48	79
3.51	80
3.62	81
3.76	82
3.88	83
4.02	84
4.17	85
4.29	86
4.50	87
4.67	88
4.78	89
5.03	90
5.25	91
5.47	92
5.75	93
6.04	94
6.50	95
7.01	96
7.50	97
8.40	98
10.02	99
22.50	100