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
0.17	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
0.50	19
0.51	20
0.55	21
0.58	22
0.63	23
0.67	24
0.69	25
0.72	26
0.77	27
0.80	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
1.29	41
1.34	42
1.40	43
1.40	44
1.43	45
1.51	46
1.52	47
1.59	48
1.64	49
1.67	50
1.72	51
1.75	52
1.76	53
1.81	54
1.88	55
1.93	56
2.01	57
2.03	58
2.09	59
2.15	60
2.22	61
2.26	62
2.34	63
2.34	64
2.35	65
2.44	66
2.51	67
2.57	68
2.63	69
2.69	70
2.78	71
2.84	72
3.00	73
3.02	74
3.04	75
3.15	76
3.26	77
3.38	78
3.50	79
3.52	80
3.67	81
3.81	82
3.93	83
4.03	84
4.20	85
4.34	86
4.51	87
4.67	88
4.80	89
5.02	90
5.25	91
5.46	92
5.71	93
6.02	94
6.38	95
6.86	96
7.34	97
8.22	98
9.68	99
22.83	100