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
0.20	7
0.21	8
0.23	9
0.25	10
0.26	11
0.29	12
0.33	13
0.34	14
0.35	15
0.38	16
0.41	17
0.44	18
0.48	19
0.51	20
0.54	21
0.59	22
0.62	23
0.65	24
0.69	25
0.72	26
0.76	27
0.79	28
0.84	29
0.88	30
0.90	31
1.00	32
1.01	33
1.02	34
1.04	35
1.10	36
1.15	37
1.17	38
1.21	39
1.26	40
1.28	41
1.33	42
1.39	43
1.41	44
1.43	45
1.50	46
1.52	47
1.57	48
1.62	49
1.67	50
1.72	51
1.75	52
1.76	53
1.80	54
1.87	55
1.91	56
2.01	57
2.02	58
2.06	59
2.13	60
2.19	61
2.26	62
2.33	63
2.34	64
2.35	65
2.41	66
2.51	67
2.56	68
2.63	69
2.68	70
2.75	71
2.81	72
2.93	73
3.01	74
3.03	75
3.12	76
3.24	77
3.35	78
3.45	79
3.52	80
3.61	81
3.76	82
3.88	83
4.02	84
4.15	85
4.29	86
4.44	87
4.61	88
4.75	89
5.01	90
5.18	91
5.39	92
5.67	93
6.01	94
6.34	95
6.81	96
7.26	97
8.08	98
9.57	99
22.83	100